Changing Cover Art with ID Tags

[Threesigma1]

Can someone suggest how to change existing album cover art? When I add new art from the Internet the program shows different art to an album even after selecting the (x) for the preexisting album art I am seeking to change. Is there a way to delete the assigned art as the initial step?

[Spoon]

Which program is showing the wrong art?

[threesigma]

Thanks for your reply. ID Tagger is the program I am using.

[Spoon]

You are best using the 'Album Art' program in the PerfectTUNES suite for easily replacing existing art.