Board signature can not be edited

Hi

I activated the plugin in the CB Forum integration and use CB with Kunena. Unfortunately I can in the CB profile no longer edit the signature. The field is locked. I have already seen several php files, but nowhere is the signature forum set to readonly.
This is how the edit box of the signature from board with me.

I found the bug. I set the field forumsignatur read only yes.

I'm Sorry