In the rich text editor:
@Ringo242
In a comment:
[Ringo242](https://chowlings.com/user/Ringo242)
For Names and Avatars:
In the rich text editor:
%Ringo242
In a comment:
[![Ringo242's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Ringo242) [Ringo242](https://chowlings.com/user/Ringo242)