In the rich text editor:
@FakeJunker
In a comment:
[FakeJunker](https://chowlings.com/user/FakeJunker)
For Names and Avatars:
In the rich text editor:
%FakeJunker
In a comment:
[![FakeJunker's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/FakeJunker) [FakeJunker](https://chowlings.com/user/FakeJunker)