- Reputation button, you press that to add reputation to users. Most low post users (1-1000) don't give any rep, it shows up as 'gray', instead of green. There is no way to remove reputation after you've given it, nor can you give negative reputation.
- Thanks button, pressing it gives a user a 'thank'. There is no way to remove a thank once you've given it.
green box is where the reputation button is located, blue is thanks.
also you may want to post some more, 15-20 posts earns you a member level 1 tag which allows you to have permissions of regular users.
what the tag looks like -