Setup your own tracking domain.
1. Register for some new domains. You can do this on www.namecheap.com or www.namesilo.com or any domain management site.
2. Setup CNAME record.
How to setup CNAME on Namecheap.com
How to setup CNAME on Name Silo
3. Within Track Revenue / Track Revenue Settings / Tracking Domains
4. Enter in your new domain. Set as MAIN, and ENABLE.