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