In the rich text editor:
@TV_thari
In a comment:
[TV_thari](https://chowlings.com/user/TV_thari)
For Names and Avatars:
In the rich text editor:
%TV_thari
In a comment:
[](https://chowlings.com/user/TV_thari) [TV_thari](https://chowlings.com/user/TV_thari)