There's a drain bolt on the bottom of the gearbox (you can't miss it) and a drain bolt at the bottom of the in-frame tank (just below the exhaust manifild where it comes off the head).
Don't forget that the oil filter will also still have oil in it.
Once drained and the oil filter is repalced, make sure your two drain bolts are back in and fill her up through the in-frame tank.
There's a small bolt on top of the oil filter cover, which you will need to crack as you start the bike to bleed off the air in the oil filter cavity. Be ready to put it back in though, or you will have oil going everywhere!
Hope this helps, Dan.