I was wondering how to refer someone to a proposal, because I was on this proposal and some people have referred people but I don't know how? And since I committed to the proposal I am suppose to help by referring and stuff.
Suppose that you want to refer someone to the History of Science and Mathematics proposal. Right below the green box with the number of committers (or, if the proposal is not yet in commitment, below the orange box with the number of followers), there is a "Share This" link:
If you click on that, a dialog pops up with a box that contains your personalized referral link for that proposal:
Copy that link (in this case, http://area51.stackexchange.com/proposals/65204/history-of-science-and-mathematics?referrer=Mnr-sYI3xxLnLy5b04it1g2) and share it with whoever you want to refer. Keep in mind that the people you refer will see your Area 51 username when they follow the referral link:
If someone follows your referral link and then follows or commits to the proposal, you will earn some reputation, and that person will be marked as having been referred to the proposal by you.
Of course, if you don't care about getting reputation for referrals, you can just share the link to the proposal by copying it from the address bar: http://area51.stackexchange.com/proposals/65204/history-of-science-and-mathematics.