In the rich text editor:
@Scib
In a comment:
[Scib](https://chowlings.com/user/Scib)
For Names and Avatars:
In the rich text editor:
%Scib
In a comment:
[![Scib's Avatar](https://chowlings.com/images/avatars/1237.png?v=1644063259)](https://chowlings.com/user/Scib) [Scib](https://chowlings.com/user/Scib)