Your CodePen account comes with the option to “bookmark” a Pen or Collection so you can easily get back to it from anywhere in the app.
To bookmark an item, tap the bookmark icon on any Pen or Collection. The icon will turn blue to show that the item is pinned.
To access your bookmarked items, click the dropdown menu icon to the right of the bookmark icon. That will open the bookmarked items modal. Your latest-bookmarked item will be at the front of the list.
Bookmarks are similar to Collections. They are essentially one Collection designed to be super quick to access.