You need trust level 3 to be able to post links. The short of it is you need so many likes, have liked so many comments/replies, created so many posts and comments/replies, and read like 20,000 comments. The first few are generally easy enough to get. For reading posts, you can just find some of the massive threads and scroll through them. Once a post is read, that lil blue dot on the right hand side of each comment goes away. Unfortunately, you can’t check to see where you’re at with each of the items. Also, can’t have any recent suspension (6 months). Even a one day suspension for trolling will make you lose it and plenty of people on this forum will gladly flag something as trolling. Some mods are great and understanding, some less so.
More info here.
You can also see your trust level.
Glad to repost something though if you need as well.