i need help finding this blade faction thing apperently i joined and i dont know how i did can some one help me find it.

Are you talking about the fighters guild or the dark brotherhood or any other. Because I can help with every.

Hopefully

no i know were those 2 r its just this blade guild/faction thing im in i mean i dont even know how i got in it or were to find it if anyone has info on this blades guild/faction thing plz let me know

After you escort Martin and Jauffre to Cloud Ruler temple, Jauffre offers you the chance to join the blades. If you accept, you become a Knight Brother/Sister in the Blades. However, the Blades do not offer any specific quests or have any service NPCs. Mostly I think it is for lore reasons; it makes sense that the "hero" that is saving the empire and the heir from the Daedric invasion would be a member of the Blades.

Dark Brotherhood, Knights of the Nine, or Fighters' Guild?

The Blades are not a Guild, you can join them and get access to the entirety of Cloud Ruler Temple, but that is all. There are no side quests.

Hope I helped,

-Liam