Some webpages have text fields and forms to fill out. You can set Safari to remember names and passwords of websites you visit and fill out text fields automatically with information from Contacts. See General.
Tap inside a text field.
Tap another text field, or tap the Next or Previous button.
Once you finish filling out a form, tap Go or Search. Most pages also have a link you can tap to submit the form.
Tap Done.
In Settings, choose Safari > AutoFill, then do one of the following:
To use information from contacts, turn Use Contact Info on, then choose My Info and select the contact you want to use.
Safari uses information from Contacts to fill in contact fields on web forms.
To use information from names and passwords, turn Names & Passwords on.
When this feature is on, Safari remembers names and passwords of websites you visit and automatically fills in the information when you revisit the website.
To remove all AutoFill information, tap Clear All.