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You have to put this in annoucments.
And it says guest because there is a thing called Using php in posts is called being a smart [Language]... Stop it so if you're not logged in,it says guest.

Man, I know that but how can I make that on my forum?

She told you but it is censored here so it turned out to be language.

There was a list somewhere but I can't find it.

{FORUMURL }
{FORUMURLINK }
{FORUMNAME }
{FORUMNAMELINK }
{FORUMDESC }
{FORUMBIRTHDAY }
{FORUMAGE }
{FORUMCOUNTFORUM }
{FORUMCOUNTOPIC }
{FORUMCOUNTPOST }
{FORUMCOUNTUSER }
{FORUMONLINEUSER }
{FORUMONLINEDATE }
{FORUMLASTUSER }
{FORUMLASTUSERLINK }

USERS :

{USERNAME }
{USERLINK }
{USERBIRTHDAY }
{USERAGE }
{USERREGDATE }
{USERLASTVISIT }
{USERCOUNTPOST }

That are all I think, remove the last space before } to have it work.
They basiclly do (show) what they say.

This is the one you need

{USERNAME }

Basiclly all you need to do is write in your homebox:

Welcome {USERNAME } have fun!

No spaces included and it will work.