From the Windows desktop, go to the Charms menu by pressing the Windows key plus C and selecting Settings. Select Control Panel from the Settings menu. Change your account name in the User Accounts window by selecting Change Your Account Name. Change your local Windows account’s username in the same window.
If Instagram refuses to allow you to create a new username, it’s most likely because it does not fulfill one of the requirements outlined previously. The most frequent issue is that the name is already in use, therefore try another one.
Don’t include your whole name or part of your address or phone number. nnUsing the same username and password combination on different sites is a good way to get hacked.