you have to go to a green portal and teleport back to the city ang go to your Tamer Home
and eventually your digimon heal to full health.. if you're too far from a portal try
using items in case you ran into a monster

1.You go to a green portal and just get back to the place where terrieramon(spelling) is
and they will heal.2.You use one of those health kit things and give it to a digimon that
needs healing.3.When a digimon dies and you get to a diffrent battle it will have one hp
left.

go to your tamer home through the pink/ purple portal and all your digimon will get healed