To install it, simply run the following command on your tinkerboard
sudo apt-get update
sudo apt-get install x11vnc
Once installed you can start the vnc server using:
x11vnc -noxrecord -forever
If you want to run it with the password, first set a password using the following command
x11vnc -storepasswd
Now you can run the x11vnc with the password, run the command
x11vnc -noxrecord -forever -usepw
Now, on the mac if you want to connect to the tinkerboard in the terminal type
open vnc://ip_address_of_tinkerboard:5900