theres a button on the top right of every post. Click that and youll get the option to +rep or -rep. i believe once your a member you can rep. correct me if im wrong . the button looks like a scale.
im not sure how long, but after a certain amount of time you can leave rep. new members just leave a purplish grey bar which is neutral use a search there are TONS of threads about rep
ive been registared for a whole 18 hours now and i see the little plus or minus rep bar... and i dont think the admin gave it to me because im dashingly good looking. apparently all members, new or old, can give rep
no, you misunderstood me if YOU were to try and give me rep right now, it would show up as neutral rep my friend, meaning you could not affect my actual reputation