Overview
Sales Analytics is accessible via your primary (aka master) account and via your account nickname.
Related: How do ClickBank accounts work?
What if I don't remember what my master account email is?
If you have forgotten what email address you used for your master account, you can find it in your account nickname under the Account Settings tab. 
For information on the Sales Analytics feature, check out this article: Using Sales Analytics.
Additional Resources & Related Articles
- BLOG POST: What data should be tracked? | ClickBank Affiliate Edition
- KNOWLEDGE BASE ARTICLE: Reporting FAQ
- KNOWLEDGE BASE ARTICLE: Sales Analytics FAQ