In the rich text editor:
@SheebDoggo
In a comment:
[SheebDoggo](https://chowlings.com/user/SheebDoggo)
For Names and Avatars:
In the rich text editor:
%SheebDoggo
In a comment:
[](https://chowlings.com/user/SheebDoggo) [SheebDoggo](https://chowlings.com/user/SheebDoggo)