If you find an opportunity you're interested in, you can save it, and come back later to apply.
When browsing the list view you will see a 'Save' button on the right side of the opportunity ticket.
If you click save you will see the button change to 'Saved'.
The same button can also be found at the top and bottom right of the opportunity detail page, to the left of the 'Apply now' button.
These saved opportunities will then appear in your saved opportunities where you can see an overview of all of your saved opportunities ordered by deadline.