I don’t have a computer to plug my iPad in to.

To restore an iPad from a backup or to factory settings, you’ll need access to either a Windows PC (with iTunes for Windows installed - or the more recent Apple Devices App) or a Mac computer (with iTunes or Finder - as appropriate for the installed version of macOS).

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Use of a PC or Mac is unavoidable. If you don’t have access to a suitable computer of your own, that of a helpful friend or family member will suffice. Alternatively, the technicians at the Genius Bar of your local Apple Store will be delighted to assist:

Genius Bar Reservation and Apple Support Options - Apple