Adding text to footer

Using the TwentyTen theme, I want to add the text “Site developed by BeeJayEff” to the footer, centred between the Site name and the “Proudly powered” link. I’ve found plenty of discussion about removing the “Proudly powered” bit, but not on how to amend the footer otherwise. I’m sure it’s a simple thing to do, but it’s all new to me ! Help please.