Posts unseen,

Hello,
i am part of a group or a site , where we exchange ideas & clues about a game & all of a sudden , they will just throw me out of d conversation ...so i could see that someone posted or commented on the site as it brings me a notice , but when i go to the site , i cant find their messages...then it will start like that ...i will post ...go out of the site ...play d game...& when i go back to d site...i cant see my own posts....ofcourse they will reappear in around 3 hours.....also as yahoo & fb are intertwined...i would like to change my password & E-mail address....but dont know how to change my yahoo password in order to eventually change my E-mail address.....because i think this is where the loop starts (when they drop me out of the chats), because my yahoo password is very easy to know....thanks a lot..