First Oil change - need help

This is my first oil change on my WR450F and the instructions aren't that clear to me. Do you fill the engine or the frame, or a little into both? I'm trying to get ready to go riding this weekend, so any help would be appreciated!

Drain both plugs (frame and engine case). Remove filter and replace. Put 1.2 litres of oil in the engine crank case. Check oil level in upper frame after running the bike for 10 seconds. Add oil to crankcase only. Check level, repeat until satisfied.

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