Plenty of Fish (POF) is not officially available for the iPad but you are still able to download it. This tutorial will show you how to download the official POF dating app to your iPad.
POF for iPad
1. Search for POF in the App Store then hit iPad Only in the top-right corner to open the drop down menu and change it to iPhone Only.
2. You will now see POF in the search results. Download it and start chatting!