To update your iPads Version please follow these steps:
Step 1: Plug iPad into a charger
Step 2: Open Settings
Step 3: Select General
Step 4: Select Software Update
Step 5: Select Download and Install
Step 6: Enter your passcode
Step 7: Allow time for your iPad to update
Once your iPad has rebooted, your update is complete.
After you enter your passcode, some apps may begin to update, please allow them time to update as well.