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