Reporting test score in the common application

Under the testing section on the Common Application, it asks to report the highest subscores. But my second test score probably won’t come out by the ED deadline. Should I just report the score of the first test.Do I have chance to update my Common Application after I have submitted it or when my second test score comes out?
Do I have to submit my common application first in order for the recommenders or counselors to submit their part.
Thanks,