I am not very good at golfing by myself, but once in a while, I come across something small that I notice that could help. These are typically tricks I have found while looking at tips. Some users would not think of these, as some are very strange. I would like to comment, but I do not have 50 reputation yet. I know that editing is not a good idea here, so what should I do?
Comments requiring reputation is an unfortunate situation, but it is (sadly) necessary to prevent comment spam. There is no manual override; the only way to post comments is to earn the 50 reputation points it requires.
There are a few ways to achieve this. You might already be familiar with them, but I'll list them anyway.
Post answers. You might not be very good at golfing right now, but we all weren't at some point. Just tackle a few easier challenges first, and you'll see that you improve quickly. Since every upvote earns you +10, gathering 50 rep should be pretty quick.
Post challenges. For most of us, that's actually harder than posting answers, but if you post the in the sandbox first, the community can help you to improve your draft.
Earn 200 rep on any single SE site. Once you do, you'll get a +100 association bonus on all other sites.
You can also try to find the user's chat profile and invite them to some other room you're already in, or you can create a new room for a conversation between the two of you. http://chat.stackexchange.com/users/
This is a temporary solution you can use until you gain enough reputation to post comments, because comments are usually preferred to chat messages unless that question or answer is being actively discussed in chat.