Yes, you can edit the projects in a campaign.

After creating a campaign:

1. Click Campaigns in the main menu at the top of any page.
   
   
2. Choose the campaign you want to edit.
   
   
3. Scroll down to the event containing the project you wish to edit, then click the name for the event.
   
   
4. Click the Edit Project button.
   
   
   
   
5. Edit the project and save your changes as you would normally.
   
   

When you finish editing you are returned to the campaign displaying the event for the project you just edited.

Be sure to check that the event status is set to "On" and that your campaign status is "Active" if you are ready for events to be sent as scheduled. If the campaign is active, the "Pause" button will be visible at the top. If the campaign is not active, the "Start" button will be visible at the top.