Hold down your power on button (on the left side of the plinth) for a few seconds and it will turn red and go at 45 rpm.
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Hope I can give you an accurate answer.
If you have Lingo power supply (a separate box), follow Sc53's instruction. Otherwise, check that your motor pulley has 2 ring, one for 33, and the bigger wheel for 45.
If you don't, then you need to order the 45rpm adapter from Linn. It cost $60 or so, and just snap in, but it is very tight and almost impossible to remove if you change your mind.