Yes and No.
Yes, because if you catch a misspelled word or grammatical error this information can be updated while your campaign is live.
No, because if you edit the order of your questions it will negatively affect your analytics. Adding, removing or editing answers or questions while the campaign is LIVE is NOT RECOMMENDED and will cause errors in your reporting. Just Say No.
Please note, that this is while the campaign is LIVE - meaning sent out to potential customers or has gone viral on social networks. If your campaign is not live yet, change away!