If I remember correctly, Vu have an issue where the drivers make the EPG button show up as INFO. People with other receivers may not need to do this. However, I have worded it so it can be adapted for any purpose.
First of all, put the image into expert mode.
Menu > Setup > System > Customise > Setup mode > Change to expert
Menu > Setup > System > Expert Settings > Hotkey
Press Green to toggle the "extra keys"
You then press the button you want to change and assign the function.
In this case,
Press OK, a list of function swill be shown. hightligh the one you want and then press OK. (We want EPG, that is already highlighted.)
The list of options are shown in teh category. The set items are in bottom left. If two functions are assigned, you will have to choose after pressing the button. Seleting teh function again removes it from the list.