I usually hate spoon-feeding as everything can be found on here/google, but here goes:
Note, this may be different for other images - This is howto for Pli Jade 3 on Enigma1 boxes
(Latest Open Pli image is even easier, as it uses Rytec'sOpenXML EPG plugin)
Activiate Sqlite:
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Blue button:
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System properties.
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EPG
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EPG store: select SQlite Choose a place for the database on the network mount.
Next install the SQlite EPG download plugin:
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blue button
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Software
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download EPG Plugin (best one I find is Radio Times EPG plugin)
Start the Dreambox EPG Config via the Yellow button, select Dreambox EPG Config (Radio Times EPG Plugin).
The next screen appears:
Select Package:
Press the blue button to see the channels ,you have to map them by linking them to each other in the left and right boxes,this can be a pain but you only need to do it once.Once your done green button to save,then select the following.
Time Offset: 0
Number of day: your choice but i find it best at 3 days
Use Cron: X (if selected, make sure you enable cron daemon in your setup)
Update at: Select a time that the update is wanted.
Press Retrieve (Yellow button). A retrieve will take between 5 and 10 minutes.
There is a more detailed guide on the pli wiki page, but follow the above and you should be ok.