In the rental deck selection page there should be a link to the deck missions. Having to go back out to the Battle page, click missions, click decks, is too many steps and hard to remember.
Below Pikachu ex did 90 damage but has no energy attached: But here you can see there are energies attached: That 1st image is from the app in Play Store, so either fix the bug or put a picture with the correct number of energies…