You need to take a screenshot of the completed quest. For example in the first quest you need to reach level 8 and the rank of cavalier. One you have reached this you need to screenshot it and send it in where it says add screenshot by the quest. I usually use snipping tool to screenshot but there are other ways. I hope this helped, if you still are confused on what to do message me further under my username, icon, and information, where it shows a green envolope. If your screenshot gets denied contact support on the bottom right.
If this is just saying that you want bananas and that you dont need help with getting them, well alright then.