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Without knowing the image it's difficult to know what options are available, some have uninstallers others have scripts which can be ran others have nothing obvious
There are a couple of things which should work on most enigma 2 images
Telnet
Telnet into your box from a computer
Type the command Ipkg list
Make a note of the package name
Type the command ipkg remove package name
Then restart the box
Or you could just google tspanel, install this the same way you done the original plugin, restart and use the uninstaller within the menu
Lastly FTPing the box could work, I wouldn't do it this way in case files have been installed to more than one location