Hello, @adanewman!
Thanks for posting your question!
Please open your Google Analytics account, choose the account you want to link with AdSense and navigate to Admin tab.
You will see AdSense Linking option under Product Linking settings. Open AdSense Linking and click on New AdSense Link button.
Afterwards choose the necessary AdSense account you’d like to link with your Google Analytics, then click Continue.
Choose the views of Google Analytics, where you would like to have AdSense data. The accounts will be connected after clicking Enable Link and then Done.
Thanks! Have a wonderful day!