"How do I delete Unwanted Auto-Fill Information from the input box in my Web Browser?"
For example: You mistype your User ID when logging into your e-mail account on-line. This is a pretty common issue. Everyone does it at some point.
A web search will usually get you to the information you need. Here are a few examples:
Google: Delete Unwanted Username Firefox
Try using "Chrome" or "Safari", etc. for results specific to your Web Browser.
Firefox Browser
Viewing and Deleting Passwords
The Auto-fill data is controlled here.
Control whether Firefox Automatically Fills in Forms with Your Information
Google Chrome Browser
Autofill Forms - How To Use Autofill
Includes:
Editing Entries
Deleting Form Data
Turn Autofill On/Off
Another way to do this, and give your (MS Windows) system a bit of a boost is to run a utility like CCleaner. You will find information about that on this "a58Tech" Web, under "Maintenance and Utility" Software.
Another option is to consider turning off the Auto-Fill function in your Web Browser. For sure, this is something you do not want to see activated on a publicly used PC.
:-)