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