Which theme suitable for support ticket?

Hello my friends,

I've already install the support system plugin in my multisite.

1. Which theme should I use that suitable for support system in wordpress?

2. Where should I put the support system in my site?

3. I saw that there is no any widgets to put the support system in sidebar or any place in my site. Where should I put it?

4. Is user that want to have support from me, they need to register first?

Thank you.