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