Won’t let me comment

I love this app, and it’s really relaxing, but whenever I try posting a comment on someone else’s post it won’t let me. This is really annoying because then I can’t talk to anyone unless it is on my own picture. There are also contests and things I want to enter, but cannot because I can’t comment on people’s posts letting them know I’m entering and have posted my entry.

Celetelephant about Recolor - Coloring Book, v4.2.4