Hello...
  Long time ago,I was using some codes on homepage, when I put some code
  message apear and it was something like :

  "Welcome Bokssha.Number of your post's is 554.Newest member is  Lilith,say hello to her"

  Something like that.But I forgot what should I put there for that to hapend,
  i remember there was place where I can find all kind of codes for that and similar messages,but I cant remember where:( ...  someone please tell me..

   If anyone underestand me   

You can find that list of shortcodes at:

AP>>General>>Configuration

On that page click the little * next to the words "Site description" and a popout screen will appear with the list.

Omg...  thank you  ))  
   Feeling so stupid now  

You're welcome! Actually the link to that list could be in a much better place to make it easier to find, I found it by accident one day..lol