You can click on "manage page" button on the right side of your screen and select "share page".

 

Here's how :

 

1. Find the Manage Page setting button.

 


2. A drop down menu will appear. Select "Share Page".

 


3. You can send the invitation via email. Simply put the email address in the send to email field and click send. 

 


 

I hope this helps. Let me know either way.

 

Thanks,