post tools to unlock content for subscribers

Hi

I came across this great site https://headzoo.com/ with great plugins. I want to use one of the plugins called Post Tools to protect my content. At the moment the tool unlock content if the visitor enters a password.

I want the content unlocked if the visitor is a subscriber and has entered his/her username / password.

From the site is clear that a few lines of php will do it but I don’t know enough.

https://headzoo.com/posttools

Thank you

Johan

johanhorak at g mail dot com