https://sanctioned-suicide.net/threads/rules-and-faq.4/
-How can I send PM's to other users?
The permission to send and recieve PM's will be granted automatically after you write a certain number of posts and are active for a certain amount of time. This is to avoid spam, low effort/lazy PM's, trolling, and not waste anyone's time. Once the permission is granted, you can send by going to the information tab of the user's profile.
*Only seems to take a day or two of nominal activity. Not like its weeks or anything. Go play some silly games in Off-topic or something if you don't feel like posting anything important just to get past the block. Some weirdos there think "counting" is fun ;)