In the rich text editor:
@Shadowgamer012
In a comment:
[Shadowgamer012](https://chowlings.com/user/Shadowgamer012)
For Names and Avatars:
In the rich text editor:
%Shadowgamer012
In a comment:
[](https://chowlings.com/user/Shadowgamer012) [Shadowgamer012](https://chowlings.com/user/Shadowgamer012)