I updated my email signature. How can I update my previous campaigns to have my new signature?

Editing your email signature in  Settings will be automatically applied to all new campaigns your create. 
If you'd like to update your current campaigns to also have your newly saved signature, simply:
1.  Edit the touches for any campaign that you'd like to have your new signature in
2. Remove your signature from the signature block and click the feather pen icon to apply your new signature
3. Click Save Changes - that's it!