It's been 2 months since I've lost my FF7 Crisis Core edition PSP 2000's battery cover, I swear to god it magically disappeared while I was taking my consoles out of the drawer...
Click on your profile pic in the top right corner, and you'll get the profile menu popup, with the profile icon highlighted at the top, and the "bookmarks" banner next to it in gray. Click on that icon and you'll get a list of your bookmarks.
And it's even better today because you can buy that storage expansion and install it without difficulty.