Using case statements to select an option

[Kassy]

I want to run a help form via a button on different forms in my database so that a user can select simple help. I have a table of :- FormID, FormDescription, Helptext. I think a Case statement might be suitable but Where and How do I go about this. I have an unbound option group with toggle buttons so option 1 might call record 1 etc? Is this correct or is there a better way. Im not sure how to write a case statement or where to add it even if I knew!