There seems to be some confusion about what mafia is. Here is a post to clarify things.
o put very simply, Mafia is a game of lying. There is a group of people, some of them are lying and some are telling the truth. Your job is to figure out who is lying, or if you are lying to convince the rest of the group that you are telling the truth.
To elaborate, the game is divided into two teams: the town and mafia. Mafia know who each other are and can coordinate their actions privately. Townies on the other hand don't know anything other than their own role. To compensate, there are many more townies than mafia; usually the ratio is 1 mafia for every 4 townies. In other words, Mafia is a game of an informed minority against an uninformed majority. Can the mafia use its superior organization and knowledge to lead the town astray? Or can the town figure out the mafia and kill them before their numbers advantage runs out?
At the beginning of the game you are PM'ed your role. The game is divided into two repeating phases: day and night. Days last 10 days and revolve around deciding a lynch target by means of voting. Every player in the game gets one vote, and each player must argue and convince the others to lynch their target. At the end of the day the person with the most votes is lynched; their alignment and role are revealed and they are removed from the game. The majority of the action in the game takes place during the day phase.
Night is 48 hours long and is reserved for private actions. Any player in the game that has an ability (such as mafia kills, detective checks, medic protections, etc.) can use their power in this phase. Usually during the night everyone discusses the results of the lynch and makes plans for the next day. It serves as downtime from the emotionally charged days. After the night ends, a day post comes up with the results of who dies. After the day post, the discussion for lynch begins anew.
Once there is a winner, everyone will typically weigh in on the game with their thought process and advice. Many times the hosts or observers will contribute their thoughts as well.
The role pm I sent you tells you what your role and allignment is, but I'm not sure if that was clear, so I'll clarify. The mafia roles will all be the names of a "Clique" member, e.x. Jorster, Darvince, etc. Town names will either be "sugg", or the name of a prominent Interguildian, e.x. Sefro, Isa, Quirvy, Soccerboy, etc.
If this is your first time, I'd HIGHLY recommend reading this whole guide, so you know what's going on.
http://www.teamliquid.net/forum/mafia/301748-a-general-guide-to-mafia