People seem to have problems with healing their survivors.
1. Select the survivor you want to do the healing. (Either the leader or a medic).
2. Once that person is selected press 'E' and hover over the survivor you want to heal, you should see a green cross.
3. Click survivor to heal.
4. When finished healing survivors press the space-bar to exit healing mode.
OR a shorter way:
1. Select the survivor to do the healing by number. (Either '1' for the first survivor, 2 for the second and so forth).
2. Follows the same steps but instead of using the mouse to select survivors use the number keys.