@silverzcloud Thanks for reaching out. You can see where that NPC is using the "Track" feature in our quest scroll UI.
Our next update will make sure this is enabled by default to help prevent any confusion!🙂
You must go to Pirate Island, the first island, and find a cave with the sapphire in it. We hope to make this process more clear and seamless in the future.
@NguyetHo18 Thanks for reaching out. If you press "Join Group", you should be able to join. If you aren't able to, you might have to leave another group before joining.