confused

I've drained all the oil out and now want to refill it. But this won't come open :( I keep getting confused which way I should even be attempting to turn it which probably doesn't help haha

hi, so i am planning to buy a new carb for my bike and i am confused with what i am trying to do should i go with a 26mm oko d flatside carb or a 28mm version? i read that i can go with a 28mm since oko carbs are known for using huges jets and stuff,, i think i can go with a 35 slow...