Plugins

hi

Quick question wondering if someone can help me with please.

ihave been developing a few plugins but when i started i added a plugin i dont want in the repositroy anymore.

if you click this link

http://wordpress.org/extend/plugins/search.php?q=isimpledesign&sort=

you will see ive got 4 plugins i really dont want the feeds plugin one because i have updated it to iSimpleDesign Feeds Plugin but the old one is still their.

how can i ammend this please?