When looking at account preferences there's a tab that says "Bookmarks", and something about dragging and dropping them, but I don't know what to drag and drop, or even if I can? Does the bookmark feature even work or was it something that was planned but not continued?

The drag and drop is for the list of bookmarks you already have. On the Right-hand side of the page there should be a little tab with a + in it. It's near the cash shop tab at the top of the page but on the right side. You press that + to add a bookmark. I hope that helps.

Thanks, I made a bookmark and it appeared but then on all other pages even after refreshing it's gone, is that supposed to happen? I've never used this before...

EDIT: After I made this post, it appeared again. I'm still confused. Does it only appear on certain pages?

It should show up on all pages (probably not pet pages, but all other ones as far as I know?) but there could be a cache delay before it shows up consistently

That might be it, it seems to be showing up in most places now.

I guess this thread can be closed now.