To connect to your seedbox for VNC connection you need VNC Viewer, so you must install it first. We recommend a free program tightvnc which can be downloaded here.
Now start TightVNC Viewer and you will see:
Give your VNC address which you got in the email with login data in TightVNC Viewer. Then click enter, the program will ask you for a pass which you need to give and then click enter . Now if you have done everything correctly you will see a remote desktop.
If the connection with the remote desktop works slowly, we suggest setting Low-bandwidth connection.