Use tri-flow everywhere you would use regular sewing machine oil. It should be simple to convert to a foot pedal. Take a look at your knee lever. Many are simply foot pedals with an extra piece attached for your knee to push against. Personally I prefer a knee control. You always know where it is. I don't know if the opening and hinge placement are the same as other machines.
It could be your pictures are too big. I think QB has a size limit.
Rodney