Once you have a choice activity set up it is simple to use.
Students visit the choice activity, select the option they wish to answer, and click "Save my choice".
If they see anonymous results, they may see a bar graph like this:
You as the teacher would also see this bar graph, but you also have a link near the top right that says "View X responses" where X is the number of users/students who have answered the choice activity.
You will see all responses, who responded what, and have the option of deleting responses or downloading all responses in various formats.