Yes you can. Click on the edit icon in the meetings list:
This opens your meeting's settings and this is where you will see the Delete button in the bottom, right-hand corner:
Be careful though, deleting your Meeting means all your meeting data and results will be removed. We recommend you save and print a copy of your meeting's data report before deleting, just in case. Just click on your meeting name to go into the meeting and in the left-hand menu, go to 'Data' and click 'Report' to download all your meeting data to Excel®.