Remove the fill bolt first (always a best practice to ensure you can put fluid bak in) and then remove the drain bold ensuring you have a container large enough to capture about 250ml of oil.
Inspecth the drain bolt for metal fragments stuck to the magnet.
Throughly clean both the dran and fill plugs. Install the drain plug uisng a new crush washer and tighten to specs or hand tight and then another 1/4 turn or so. Then full the fuid (about 250ml or until it starts to over flow) and install the fill plug and check for leaks.
I used Valvoline 75w90 synthetic gear oil but you may want to use something else depending on your geographic location and use.