Here are a few things I can say:
1) Always be mindful of the topic of the thread. If it's a vendor / sales thread, you should only post reviews of that vendor. For instance, don't post that you ordered. Post when you receive.
2) When you do receive, be mindful of other members safety & security before leaving a review. Don't post details about anything outside the packaging. Like the color, shape, size, etc. It's wise to not post the payment you used. And also don't be ultra specific about location. It's fine to post a general location like "MWUSA" just try to keep it vague.
3) Complaints! People on here have a bad habit of placing orders than getting nervous and making irrelevant posts. Either cause they didn't read a vendors thread, they're impatient, or not very good at managing time. Like they wait till the last minute to order then take that out on the vendor when it's really their own fault. A good way to avoid all this is to just READ. If you're going to use any vendor, try reading a MINIMUM of 10 pages back so you're up to date with any changes that may be going on (shipping delays, etc).
4) The SY section is the mexican pharmacy section. It use to be open to the public in the past. But the forum has since underwent an awesome upgrade. This forum seems to be growing pretty fast, and with that comes more costs. So if you donate you can access that forum. SY vendors tend to be more expensive than the international section. But the benefit is faster shipping. And they also sell certain meds I've never seen international vendors selling.
5) Email sources aren't openly promoted. They're a bit "taboo" on here. That doesn't mean you can't use them but you need 50 posts to post in that section.
6) Sourcing things all comes down to research. As far as I know, all contact info for a vendor is on the 1st page of their thread. Some vendors have websites. So you have to register with the site to see their menu. Other vendors you have to email to get a menu. Make sure whatever you do that you use the CORRECT contact info. Always double and triple check to be safe.
7) Scamming! This is probably the #1 reason this forum exists. If you blindly go searching on Google (for sources) chances are you'll get scammed. On this forum, I've never been scammed. Because I read and research. I don't message people for sources. It's not safe. As far as "navigating" you just click whatever thread you wanna read. Then read it. If you like the reviews and what people are saying about the vendor then ask for a menu. It's really not complicated.