It seems that you're going to restore your iPad by going through recovery mode. But before you do so, I'd recommend backing up your iPad (if you can).
In order to get into recovery mode, you'll need to hold down on the sleep/wake button and home button at the same time. During that time, the rolling will happen:
- The screen will go blank
- The Apple logo will appear
- An icon of the Lighting cable (or 30-pin connector, if it's an iPad that uses the connector) and the iTunes logo will appear.
You can let go of the buttons once you've reached to that area.
After that, plug it into your computer and open iTunes. You'll see a message saying that it's found an iPad in recovery mode and it needs to be restored." Click Ok and then click on "Restore iPad..." and then click on "Restore and Update". It'll then download the software update (if your computer doesn't have it) and will restore it from there.
Once that's done, you should see the "Hello" screen. Swipe to the right and follow the instructions. When you reach to the area that asks you whether you want to restore your iPad with a backup or set it up as a new iPad, depending on where your iPad's backup is (iCloud or iTunes), select either "Backup using iTunes" or "Backup using iCloud".
Hope this helps your problem.
(Please note that this solution works whether iTunes is installed on a Mac or Windows PC.)