After being sorted you should contact your head of house for the common room password, the heads of house are listed below.
Zapetto
Professor Annabeth Chase
Profile: http://hogwartsrises.yooco.org/profile/Annabeth_Chase.html
Komalia
Professor Annoriel Woods
Profile: http://hogwartsrises.yooco.org/profile/AnnorielWoods.html
Prodiglis
Professor Emily Sands
Profile: http://hogwartsrises.yooco.org/profile/EmilySands.html
Norqua
Professor Carmilla Hollstein
Profile: http://hogwartsrises.yooco.org/profile/Carm_Hollstein.html
After you contact your head of house they will add you to the house and give you the password, You may not join more than one house or your account may risk being suspended.