Welcome too. SweetPoison's suggestion is a good one - or you could try powering off by holding down the Power button for a couple of seconds until the slider control appears, accepting the offer to switch off, wait for the iPad to power down, then pressing the Power button again until the white Apple logo appears and wait for it to power up.
SweetPoison's suggestion is rebooting your iPad, the one above is just powering it down (notice the difference - to power it down you don't hold the Home button).
But, if the problem persists, get back to us and we'll try some more esoteric solutions.....
Tim