You can only shorten wiki links on the wiki.

For forum links, use the [forum] BBCode tag with the forum thread ID that can be found in the URL. This thread's ID is 19, for example.

(Sorry for taking so long to respond)
But how do I shorten wiki links in the first place?

Same syntax as on Wikipedia.

Is there a legitimate reason for the rule against paid content being prohibited here as opposed to on Danbooru? I don't mind the rule, and I get that the danbooru bot basically gets free reign to upload whatever the hell it wants, but there are entire pages of patreon posts being posted and nothing is usually done about them. These are only the artists that I'm personally aware of, but ANYTHING that is uncensored (that hasn't been decensored by users or posts older than a couple years, possibly even further back than that) by the artists oxxo (dlengur), zen_o, ginhaha, lasterk, and rak_(kuraga) are Patreon Rewards. I'm sure there are others, but rak_(kuraga) (goes by jellytit7 on pixiv) and zen_o are the major offenders lately, I've flagged the zen_o posts when I see them but there are far too many rak_(kuraga) posts for me to effectively flag.

9 times out of 10 if you see Patreon reward posts on exhentai that are also on here they are paid content, just saying.

Just me venting, personally I'm tired of flagging posts and am about tempted to not do it anymore.

Unfortunately we only have about half a dozen active mods, so we don't really have the resources to actively monitor for Pareon rewards. The ones we end up removing are the ones we stumble upon while doing other things or ones that have veen reported by users. When you find them, please message a mod or post about it in the Gardener's Guild forum thread to let us know so we can deal with them.

If you flag paid content for being paid content, it will get deleted. There's not much we can do to stop the flow of paid_reward posts because as Jerl said, we're not exactly well-staffed enough, but I will go through those artists within the next week and delete what I can tell to be paid rewards.

Is there a thread specifically for requesting tag renames?

So there isn't, alright.

How can I find the Discord chat?