Why is it prompting me to find that big guy, but when I click it, it says to find her, even though she is right in front of me?
I'm sorry, but I'll need more context to help you! A screenshot would be good as well ^^
I'll also link you to the walkthrough just in case: https://www.patreon.com/posts/119207938
I understand!
I'll make sure to fix this so it's easier to understand. You have to talk to Vestia, but only after you help Vanille!
Vanille needs you to put Seashells in the pillar slots. There should already be two in place, you need to drop the third one from your inventory and to place it in the slot with right click. If you don't have any seashell, Vanille should have some in storage, or you can find more in the ocean if you click pink shells on the cave walls ^^