Hi, when your new you only are allowed do certain things. when you reach 20 then 50posts you will be able to view other people's profiles and pm and email and more signiture space.
rep power is
you see these underneath your name, well the scales in the middle allows you to rep someone its like a little thank u i guess then if when you click on 1new rep comment at the top of the page and scroll right down to the bottom you will see what thread it was for. i hope this makes some sence and i havent confused you more!!! xx