Please help me make the necessary amendments, why is there now progress by %? Where do I go from here ?

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I do not know why I am being stopped from proceeding by this notification.

I have not been able to open the development org that has the same features as the one in the lessons. Ie, SETUP. This makes it impossible, actually, to practice what I am learning. Can someone guide, please?

I am still looking for how to start ansrwring this question. How and where do I create this ?