It doesn’t show the answer text box

When I try to reply to a user the text box doesn’t show up.

Only thing I could come up with it was to leave a comment.

I tried to solved this from the back end, writing an answer there to his question, but it only show up in the back end and not in the front end.

This is the url: http://thecrazytravel.com/questions/pregunta/reparaciones/