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