Using the F-Buttons (F1,F2) also known as Y=, Graph, and the others on the top row are always good for functions like that
It's gotta be something inserted into the text. Shyne doesn't have any editing capabilities on its own, it just reads programs designed for it. All that's in the OP somewhere.
I'll probably end up going with square brackets for highlighting, -> for indents, and negative as a legitimate escape character (so if you need to use -> in the text, you just type - ->).