pacific

hi.... i'm new in php and i did new website by dream wever and i want make some thing like pass and i don't know how to do it .... i need to know how to add php command to make submit work ass user name and pass ....and what i need to add in my server to resave the information about the users ...exg...text or what is the file which will resave the information and know if the user name and pass are right and how to save all users profile and picts in the page .... so if u can help me plz i will preciate .that for u ... and remember i'm new in php .... thx