In the rich text editor:
@timotei
In a comment:
[timotei](https://chowlings.com/user/timotei)
For Names and Avatars:
In the rich text editor:
%timotei
In a comment:
[![timotei's Avatar](https://chowlings.com/images/avatars/2709.jpg?v=1694430047)](https://chowlings.com/user/timotei) [timotei](https://chowlings.com/user/timotei)