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I am rotating an image by making it a sprite and I want it to start when I press return. I tried

If Returnkey()=1

but that only allows it to rotate if it stays pressed. I and I want it to start rotating on the push of a button and stop on the push of differant button.

Why not put a while or until loop inside an if statement? In english it would read

if the return key is pressed then perform the rotation code until spacekey is pressed.

so.... you have your main do loop and the above inside

do

if Returnkey()=1
while SpaceKey()=0
rem rotate code goes here
sync
endwhile
endif

rem make sure to sync outside of the while loop
sync
loop


Now if you want to make your program neater and avoid nested loops and syncs then you can just have a variable called rotate and check once per loop if the start or stop key has been pressed and set rotate accordingly. It could be a boolean variable, or just use 0 for false and 1 for true.

rotate=0 ;rem this means initially rotate is false

do ; main loop

rem check user input
if returnkey()=1 then rotate=1
if spacekey()=1 then rotate=0

if rotate=1
rem rotate code goes here
endif

sync
loop