[FilesMAker]

try this

if(!strcmp(inputtext, PlayerInfo[playerid][password]))
{
//What should do if the password is right
}

And you have this :

Код:

SendClientMessage(playerid, COLOR_GREEN,"You have succesfully logged in !");

before checking password.

Don't put the dialog call on OnPlayerRequestClass(), it will shown every time player change the classe right and left, put after password check !