Transform Tools LOCKED

I’m using ToonBoom animate pro PLE and when I try to go to Drawing>Transform>Flip Horizontally, its locked, I cant press it. Why is this happening?
Please help ASAP!

You’re in the TBS forum, the Animate Forum is here:

To reply to your question, you can’t transform a symbol.
You need to go inside the symbol and transform the image in the symbol’s timeline.