Option A:

Normally, your computer will have a white label on the top (or back) with your computer name.

Option B:

If you don't see your label, or it you want to verify what your computer name is, do the following three steps:

  1. Go to the search control on your Taskbar (normally found at the bottom of your screen, beside your Windows button).
  2. Type 'View your PC Name' in the search box
  3. In the Settings window that opens, look for the name that is beside 'Device Name'. This is the name of your computer.