Thank you so much for interest in our product. The following are our answer to your question
I want to completly remove the remove the select category.
Could you please follow this thread to learn how to make category is not require when the user post a new question.?
I want to change tag to chapter, means instead of its saying please enter your tag, i want it to say please enter your chapter.
Yes, of course. You can do it via translate tool in back-end (http://i.imgur.com/znq4ie8.png)
I want to put limit on number of question user can ask, after that they can only give answer or they can browse the website but can not post the question.
Unfortunately, what you are trying to achieve is not yet possible with the current version of the theme. It might be achievable with custom coding but that is beyond our support.
I want some section of the website where you dont have to register to browse.
Could you please clarify what you would like to do? What section that users could not registers to browse?
If you don’t enable [Login To View Content] feature in back-end (http://i.imgur.com/efjkmZH.png), anyone can login your site to view the content.
Also, lease kindly visit our demo site at here (user/password: admindemo) to get more information.
If you have any other questions, we’d be happy to answer them!