XRC - Edit jobname

I got a real simple question for you guys.

When I've copied a job and want to change the name to indicate which side of the manipulator the program should be used ex. weld-a to weld-b, how would I go about to only delete the A character in the name. As it is now I press cancel and the full name goes away. There has to be a way to only delete one character...

I think I've been able to do this before but have forgotten about it.

Quote from 95devils

When you are on the line, cursor left and right will move the cursor on the line. Down cursor deletes the character to the left.

Thanks! I knew it was possible but forgot how.