If you discover anything you wish to change about your poll before its active voting period starts, you should log into your Admin account, click on that poll, and – on the Summary tab – click the Cancel Deployment button. Then you can make your changes, and deploy that poll for review again.
If the poll is in its active voting period, you can still cancel the poll, if the errors justify it. You would go to the poll’s Summary tab, and click the Abort Active Poll button. However, you will need to think about the consequences of aborting the active poll.