Go to the Apple menu on the top left and select ‘system preferences’. From the ‘system preferences’ window, select ‘sharing’.
Enable ‘screen sharing’ on the left.
Allow access to the user’s you want to have access to your screen. This is usually your own login username you use to sign into your mac. To add a user, click the + sign at the bottom of the window.
Select your username from the list, then click ‘select’.
Connect from a PC
To connect from a PC you’ll need to download and install VNC Viewer, you can find that here.
Once you connect, you’ll see your Mac desktop.
Connect from another Mac
Click ‘share screen’ on the top right of the window, then click ‘connect’ on the dialog box. Enter the username and password of the Mac you’re connecting to.
Once you click ‘connect’ you’ll see your Mac’s desktop