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Question: How do I use my URC-7140?

I've got an URC-7140 and managed to set it up with the right codes. The problem comes when I want to use it. I explain: when I press the on/off button the TV set turns on, channel button switches channels, etc. Now I want to turn the amp on, how do I proceed? When I press the mode button several times it stays on TV, the other LED (sat, dvd, amp) are never selected. So I can't turn my amp on even having succeeded when programing it.
The manual shows how to set everything up but it does not say how to use the URC.
Any idea? I've tried several support phone numbers in different countries with no answer.