Trying to figure out how to offer media mail for free

Customer :

We are trying to figure out how to offer media mail for free. Is this an adjustment of a coupon, or something to be adjusted in the shipping part. (We’d have priority, etc stay, but free shipping if the option chosen is media mail). How do we configure this?

Support :

Please update your website with the latest version of USPS plugin.

After logging into elextensions.com you can download the latest version of the plugin from ‘My Account’ section.

After this upgrade, you can adjust Media Mail Service price with -100% to get it free.

Just put in “-100” in Price adjustment field (in plugin settings page) to make it free.