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