On your camera do you have a video mode on the dial or is there a separate switch?
If you have a video mode on the dial, select that then set exposure to manual in the video menu. If it's a switch on the top to select video, the dial should be on 'M'.
Also yes the lens should be on manual focus.
James.[DOUBLEPOST=1452794199,1452793676][/DOUBLEPOST]Just seen a pic. You have a separate switch. Push the 'on' switch one further to video mode. Then set the dial to 'M'.
You can now set ISO, Shutter and Aperture. On your screen Shutter is far left, Aperture is next in, ISO on far right. From left to right they should read (roughly) 50, 3.5, 100.
James.