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