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