There's nothing hard here. You SHOULD have a 32-bit pre-formatted USB-stick (preferably KINGSTON, other types should be tried separately, by me the UDISK 4 Gb works OK). Make sure you have only ONE partition on your stick, this does not mean you should have only 1 directory on it - as many as you want. Please create a folder (directory) with a name "plugin", open it and paste the material you want to install (a list of channels, or a plugin, e.g. Proton Tools for sharing) in it. Stick the pendrive into the USB-slot and wait, you''ll see the prompt "Install a new plugin?", click "Yes" and wait until all the operations end. You also should receive a confirmation of the successfull installation, otherwise repeat all anew. Sometimes you'll need to reboot the tuner and start your new applications (list of channels will change automatically after the reboot).
This is basically it. Good luck.
By the by, E2 is installed onto Amiko 8900 also with the USB-stick.