delete & update my own plugins

Hello List!

I built an search-plugin for our website work5.de some
months ago.
Now our website has changed and I wanted to upload a new
changed plugin.

But I don't know how to delete the old plugin or how to
update it...

When you search for "work5" at http://mycroft.mozdev.org/
 you'll find 
two plugins. I want to delete the first one (by Thomas
Winkler) and 
update the second one.

Can anybody give me some tipps?

Thanks

Thomas Winkler

(sorry for my bad english!)
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