INPUT: labels

[StephenG1CMZ]

All I can think of is to enter a default value of your variable to be a string saying "not editable" before calling INPUT. But that doesn't prevent it being edited.
You could add a
REPEAT
iNPUT
UNTIL myvar == "not editable"
If that helps.

Or change the call of INPUT to omit the variable, which would actually make it not editable.