By default, the Short URL Domain for the trackable links in ActiveDEMAND is 1ad.biz:
If you want to change it so that it would use your domain (i.e. short.myshorturl.com), you can edit it according to the next steps.
Step 1: You have to create a CNAME record on your domain with these properties:
Points to: submit.activedemand.com
Step 2: Send a message to email@example.com to verify the record.
Step 3: Once the CNAME record is verified, put the "short.myshorturl.com" into the Short URL Domain field of your account.