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