Initialization
This feature only works when you enable the formula.
If a new record is created, the formula typed into the Initialization tab is evaluated and the returned value will be written into the entry's field.
As you can see in the screenshot, the Now function is used in the algorithm.
This way it is going to fill the StartMonth entry's corresponding field with the current date.
It is important to note that within a formula, the value of an entry of an actual record can be reached through the name of the entry.
Result:=Entryname+3;
If you want to set a constant value for the entry, then instead of
Entryname:=3;
you have to use the SetValue function from the list of functions in the formula editor:
SetValue(Entryname, 3);.