how can i check if the users firstname, middlename and lastname is in the database and is the user credentials are in the database she can proceed registration and if not there will be a promt stating the user is not registered in the database
I think there are a lot of post or tutorial about login and sign in . Are a lot of informations for a single chat.
Anyway you forgot to share which database you are using now, how you stored data and your relevant blocks to fix it.
He joined 4 days ago and has a readtime of 1 min. And he hasn‘t still realized on what platform he is. So don‘t exspect too much homework from him