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.