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