To use join.me, click on Present from the left menu and choose a document.
If you opted in for join.me as an Enterprise user, you will have instant access to screen sharing!
Once presenting, click the screen share icon on the top menu bar to start join.me.
Join.me's interface will appear and any visitor(s) viewing the document with you will seamlessly transition from viewing your document to your entire screen. The orange outlining around your screen will show you what is being captured by the screen share.
Now you can minimize your DocSend presentation and show your screen to your visitor(s)!