WebAdmin is in OW just open settings >> packages >> installed
Now use the search field to find the installed plugin and press the red Trashcan to remove.
Same if you want to install a plugin but now chose All instead of installed. Use search to fine the plugin or what ever and press the green floppy disc to install.
If you also open the Plugin settings through the Pluginbrowser of your Vu+ and activate ipk upload you can upload and install any .ipk file from your computer. Just chose More to find this function.
If you install shellinabox extension you also can open a terminal connection direct from OW
So no need for any Web admin plugin. OW have it all