Sending an automatic follow-up email after 6 days

We have a trial period that automatically renews on the 7th day into a normal monthly membership. We'd like to send a reminder on the 6th day to remind people that the service will be renewing tomorrow.

I know aMember has this feature but can't for the life of me find the option. Can someone point me to it?

Using the latest version, 5.2.5

EDIT: Never mind! I found it under Protect Content. =D Wooooo

Scott