Hi, can someone tell me where to go to opt in to receipt forwarding?

Let me guide you on this, @esseyjay.

First, let's verify your email address to enable Receipt forwarding. Simply log in to accounts.intuit.com to check if the email address is verified. If not, then you need to click Verify email and select Send verification email. 

Once verified, instructions will appear on the Receipt Forwarding screen. You can now send the receipts from your verified email and send it to receipts@quickbooks.com.

To know more about this feature, you check this article: Receipt forwarding.

Please let me know if you need further assistance with this. I'll be around to help.