Joomla betting portal customization

The website runs at www.tvujtip.com. The way it works is, that you create account, log in, quess some football matches scores and then when admin adds the results, you get some points, based on how accurate your guess was. What we would need is to add some filters to the frontend and backend. First in frontend, after logon you can see the table of the matches. Above it, we would need to add the filter for sorting out the matches by weeks (attachment 0001). How it should work will be explained in by the backend section. In the backend, after logon, when I navigate to Komponenty - Tvujtip - Kategorie - I can add some categories of the matches (attachment 002). Matches administration (attachment 003) already has the filtering feature by categories, but we would need to add the same filter to the bet report, where admin can see which bets were made by the users. With this he would be able to filter the bets by the category. Bet administration (attachment 004). The same filter should be aplied for the matches in frontend - so the user should be able to filter in the upcomming matches by the category. ------ Then second customization. In the backend, there is also a button, that should erase all the points acquired by all users. This does not work now. It is located here [login to view URL]