If a password can't be saved

QtWeb can store the user names and passwords you enter on webpages, and fill them in automatically for you.

If AutoFill isn’t working:

You may have AutoFill turned off for user names and passwords. To turn it on, choose Edit > Preferences, and then click the Privacy tab. Make sure that "Save user names and passwords" option selected.
Some websites don't allow password saving. If you're not sure, contact the website's administrator.