so basically i have two problems

the first one is, whenever i try to login into any account of mine in the MC launcher

it states the login credentials are wrong? ive gone in and changed my password 4 times and it STILL says its wrong.    

my second problem is ;

whenever i am able to get into the game with accounts im already logged on to, it won't let me join any servers?? i genuinely don't know if this is just a problem on my end but, ive re-installed mc 3 times and im still having these problems :/