I would probably suggest to use a button to exit this Setpoint mode, unless you'll need to do everything really fast... which is almost impossible.

Basically, just loop in Setpoint utill a specific button have been pressed Should work. Something like...
Code:
SetSetPoint:
        LCDOut $FE,1, "Setpoint at", #SetPoint, "F"

        if Incr = 1 then 'change the setpoint
            pause 100
            SetPoint=SetPoint+1
            if Setpoint>80 then SetPoint=60 'Allow setpoint from 60 to 80
            '
            '
            goto SetSetPoint ' Refresh LCD display
            endif
            
        If YourSpecificButton= NotPressed then goto SetSetPoint