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