No worries about asking questions. That's what the forum is for! And your confusion is understandable as there is so much conflicting info on the web about bunny care.
Normally rabbits under 6-7 months of age can be free fed their (plain - no colorful bits) pellets. The exception to this would be if a bunny decides he likes the pellets so much that he eats less of his hay. But if he is eating plenty of hay (roughly his body size each day), then there is no reason to limit his pellets when he's still young.
I realize I never answered your original question. As you follow the suggestions at the link on how to safely introduce greens, your ultimate goal (couple months down the road) will be to gradually work up to feeding 2-4 cups of greens daily. By the time he's 6-7 months of age, those pellets will be reduced and then you will be measuring out his daily pellet allowance.