To compare schools, visit the school profiles you're interested in and click the 'compare' button at the top-left of the profile.
When you're done, visit your 'School List' at the top-right of the page.
This will list your 'saved' schools. To compare them, switch from list view to table view by clicking the table icon at the top-right.
From there, you can change the compare view from 'Overall' to 'Ratings Snapshot' or 'Equity.'
To unsave a school, simply unselect the heart icon.