Set up warning looking to update

Error occurred while checking server setup
The "Strict-Transport-Security" HTTP header is not configured to least "15768000" seconds. For enhanced security we recommend enabling HSTS as described in our security tips.
Please double check the installation guides :arrow_upper_right:, and check for any errors or warnings in the log.

Someone else set my computer up... and passed away 6 mos later..

I cannot find where to fix this error

Here is a guide: