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