Database help

[CDawg]

Hey guys me again,

so this time we seem to have encountered more trouble with our chat program. We are trying to implement a sign up system that would allow users to sign up for an account and then login with it,. It seems that people are able to register and it will be stored in the database, however we cannot seem to figure how to use the information that is put into the database and implement it into the login system. Again, any help would be appreciated, Thanks