First of all welcome!
Good to have you here
To register in Freenode:
/msg nickserv register <password> <e-mail>
Make sure your e-mail is legit, as it will send you a verification link.
After you've registered you can identify (log-in) with:
/msg nickserv identify <password>
If you've succesfully identified, you can join the channel with:
Sorry for all the hassle, it's to prevent trolls from joining the IRC.
(We've had some issues lately).