Adding colleges to AMCAS Application

Hey everyone!! Not sure if this is the right subreddit so feel free to remove!! Applying this cycle and working on making sure my transcripts are in order.

I have a few questions that all tie together if anyone has any input:

1. Has anyone taking a certification course through the US Career Institute? If you did, did you add it to your college list on the AMCAS application? If so, how(?), because I’m having trouble finding it and adding it.
2. Also, for college courses I took in high school, I marked them as junior college because high school wasn’t an option. Is that the correct thing to do?

I’m already submitting a little later than I like so want to minimize any delays due to transcripts. Thanks in advance!