DirectIQ allows you to edit already created campaigns that have not been sent yet. In order to do this go to Campaigns -> Campaigns List, select campaign and click Edit on the right of the campaign row.
First, you can change the campaign name and add tags.
After that, edit separately any step that you want by clicking Change to the right of it.
Here you can also change the campaign type by selecting the desired one at the top of the page and confirming this in the dialog box that appears.
After finishing editing click You're Good to Go! Start Your Campaign or Finish Later (Save as Draft) at the bottom of the page to save changes.