How to focus a meade 70az-a telescope?

The same as with any refractor telescope. Put the diagonal (L-shaped piece) in the focuser, and then put the 25mm eyepiece in the diagonal. Point at a distant object (practise in daylight) and turn the focusing wheel until the image becomes sharp. The object you're looking at must be at least a quarter mile away. Focusing is very critical, so turn the wheel slowly.