Share or post webpages in Safari on Mac
With the Share button 
, you can share a webpage from Safari using Mail, Messages, Notes, Reminders, and more. If you’ve recently shared with contacts, they appear at the bottom of the list so that you can easily share with them again.
Go to the Safari app
on your Mac.Go to a webpage.
Click
in the toolbar (or choose File > Share).Choose how to share the webpage.
When you email a webpage, Mail lets you choose whether to send it as a webpage, PDF, link, or Reader article (if the webpage is an article). See Email a webpage.
To choose which items appear in the Share menu, choose Apple menu
in the sidebar, then click Login Items & Extensions. (You may need to scroll down.) See Change Login Items & Extensions settings.
