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