This is the complete Remembering Quest guide in Disney Dreamlight Valley.
The first thing you will need to do is go to Moana’s house and inside apparently, there’s something to do.
You need to remove these nightshades and then Moana will say that there is a flower in the forest that she needs to remember.
So go to the forest of Valor and just start picking flowers. You just have to pick any flower and once it helps you find the memory then go talk to Maui.
Then it will be another memory. Now you gotta pick some blueberries in the forest. 
You have to bring Moana the Coconuts and that will be three coconuts. Coconuts are found in Dazzle Beach.
After that, pick up the leader shard that just appeared and that’s it. 