I am unable to answer a question. It does not let me enter any text in the answer box. It does not even let me click into the answer box

I have checked our demo and answer box still work.
Firstly, please deactivate all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one and let us know if you find the problematic plugin(s). Maybe there is a conflict in plugins.
If you still face there issue, you can send me username & password of your site for further checking (via private answer).
Regards,