You'll have to use a different EPUB reader like iBooks. Adobe Digital Editions doesn't exist for the iPad.
That's outside of the scope of this forum which is focused on reading PDF files in iPad and iPhone.
OverDrive works on an iPad.
Better World Books has issued an app exactly made for that: the Better World eReader!
BlueFire Reader is also a great app to read Adobe DRM-protected content on your iPad without Adobe Digital Editions.
1.DOWNLOAD BLUEFIRE READER ON IPAD
2.GO TO APPS TAB IN ITUNES OF UR COMPUETER
3.SCROLL BELOW..FILE SHARING
4.SELECT BLUEFIRE FROM LIST..
5.ON RIGHT HAND SIDE ..GO TO ADD..SELECT THAT ADE EPUB FILE..
(ADE FILE YOU HAVE DOWNLOADED FROM NET WILL BE THERE IN "My Digital Editions" FOLDER IN YOUR PC)
Problem Solved. Thanks for the instructions