(adsbygoogle = window.adsbygoogle || []).push({}); I'm posting this because people don't know how to sign up on Rebugs CFW.
Before I explain what you have to do, Just remember that its an alternative PSN server and you won't be able to play with your non-CFW friends. I take no credit for the pictures in this tutorial

Tutorial

1. Go to the Settings tab and click on Debug Settings
   You must login or register to view this content.
   
2. Click on NP Environment and type in: sp-int
   
3. Restart your PS3
   
4. Create a New User
   You must login or register to view this content.
   
5. Go to the PLAYSTATION NETWORK tab
   You must login or register to view this content.
   
6. Either Click Quick Sign-up, which can get you free games or Click Sign-up
   
7. Follow the steps of signing up and connect to PSN!

Nice tut
This should clear some stuff up

It's telling me to update my firmware...

with the Rebug CFW

you can host cl lobbies or not ??

No, get rebug.

said to me to update

he told me that I must update how I must thank you :\

You need to be in debug mode. L1+O