First you have to reach lvl 27, then you have to get Edward from a crate, (if you get him first try then you are lucky!) When you get Edward you then have to lvl him t up to lvl 5. After that you go back to Edward's Quest and tap the lock and then the sticker will appear!

Howie's info site is when you go to the character howie (he is the first water character you unlock) and you click the little i that stands for info, once clicked the sticker will appear! Hope this helped, if you are stuck on any sticker tell me I'll try to help you with description!

I am at lvl 30, For Edwards Quest I have to get Eward from a crate, can I still get the sticker without Eward?