The Single Sign On integration from Zen Planner allows members to log into Member Connect and to click a link that will log them into another website with SSO service.
If you are using WordPress you will need to set up an SSO service on your website. The SSO URL of this service can be configured in the Studio application (setup > remote login) which is presented to users in the Member Connect My Profile page.
When the user clicks on that link it will perform an HTTP POST to the WordPress SSO service. This is detailed in the document below.
To clarify, this service ONLY works from Member Connect to an external website, not from website into Zen Planner.