I used score choice to send one of my SAT scores, but now I found out I have to send all of them. Do I use score choice to send the one I didn’t include originally, or choose to send all them them again?
Makes no difference. As long as you provide all scores you will meet the college’s requirtement regardless of how many send orders it takes to do it; also sending all scores again is fine because colleges are used to getting multiple copies of the same test scores from many who have taken multiple tests.