This is part two of  the Beginners Guide to Writing Fractal formulas.

In preparation for this you need to start UF

File-new-fractal
Select Fttutorial
Click ok

Make sure you have the Properties window up click the formula tab.
In that tab, notice the three little icons at the top
       A circular arrow       reload
       Three little dots           select
       A little page         edit

This last one is the one (edit) we'll click.  Click it don't be afraid.
You should now see a fractal window with a dumbbell shaped image and a
A text window(like notepad) titled FTtut.

All the editing will occur in this window.
Highlight the existing formula and copy and paste another instance of 
it into the editor.

Change the title of this second instance to FTtutorial2 

Well what do I do now?
I think the first thing we should do is make A and B user selectable. 
Lets do it.  Any variables that are not system variables (Remember the #
sign in #PIXEL) has to be preceded by an @ symbol.  These we will need to 
define in our default section.  This is done by using a parameter block.
    PARAM variable name
      Assignments
    ENDPARAM

So lets do the A variable first. We're going to call it FTA (you can 
call it anything as long as its not a system variable) so the parameter
block begins to look like
    PARAM FTA
      Assignments
    Endparam
Whats with the assignments stuff?
These assignments are used to define your new parameter. Lets assign it 
a default value so people won't see a black screen when they bring up 
your formula.

    PARAM FTA
      Default = (1.0,0.0)
    Endparam

This is enough but lets help the end-user a little. We'll add a caption 
to the formula Tab so people will see it.  Captions need to be enclosed in 
quotes.

    PARAM FTA
      Default = (1.0,0.0)
      Caption = "Coeff A"
    Endparam

A little more user help, we'll put a hint so that when the user hovers 
over the input he'll get this little message.

    PARAM FTA
      Default = (1.0,0.0)
      Caption = "Coeff A"
      Hint = "A in AZ^3+BZ+C"
    Endparam

At this point we are going to use our newly defined parameter by 
changing the asignment in the INIT sect for the parameter A  Lets change
it from 
    A = 1 
to
    A = @FTA

Your formula should look like this now

FTtutorial2{
; If this tutorial goes any slower I'll have to go to the dentist.
; All right I made the appointment for the dentist
INIT:
  Z = #PIXEL
  A = @FTA
  B = 1
  C = #PIXEL
LOOP:
  Z = A * Z^3 + B * Z + C
BAILOUT:
  |Z| < 4
DEFAULT:    ;It's a great habit to just comment
PARAM FTA
      Default = (1.0,0.0)  
      Caption ="Coeff A"
      Hint = "A in AZ^3+BZ+C"
    Endparam
}

Click the little x box in FTtut and click yes save your changes.

In the formula tab click the three dot icon and select FTtutorial2

The image is the same as before but now you have a new drop down in the 
properties tab for changing the valut of A.

Play a little with itb
&cool huh rotates the image and stuff and when 
you click the icon at the bottom that looks like two speakers it will
restore the default value for that parameter.

Click the edit again and lets do the same for the B parameter.  Your 
formula should now look like this:

FTtutorial2{
; If this tutorial goes any slower I'll have to go to the dentist.
; All right I made the appointment for the dentist
; A root canal is more pleasureful than this excruciating slow torture 
INIT:
  Z = #PIXEL
  A = @FTA
  B = @FTB
  C = #PIXEL
LOOP:
  Z = A * Z^3 + B * Z + C
BAILOUT:
  |Z| < 4
DEFAULT:    ;It's a great habit to just comment
PARAM FTA
      Default = (1.0,0.0)  
      Caption ="Coeff A"
      Hint = "A in AZ^3+BZ+C"
    Endparam

PARAM FTB
      Default = (1.0,0.0)
      Caption ="Coeff B"
      Hint = "B in AZ^3+BZ+C"
    Endparam
}

click the close and save your changes.  Then click the circular arrow 
to reload your formula and now you have a little drop down to select 
either parameter A or B.  Hover and check out your hints

This is the end of chapter two.  Next chapter we might play with the 
bailout section or create a julia switch formula for our formula