Follow these instructions very carefully.
Find a drawing pin and using tape put it on the sewing machine ( let's make a 6inch circle) 3 inches from the needle and level with needle on the right side ie in the throat ,space area.
Now find where the centre of your circle will be on the fabric and feed quilt under foot and centre onto the drAwing pin.
Foot down feet dogs up and press foot pedal keep one hand on the drawing pin to stop fabric coming off and just guide the fabric and stop if it gets off line.
It easier without batting at first. You can also use all those fancy stitches on the machine. To make an8inch circle move the pin leaving 4 inches between needle and pin.
You can buy this part for your machine £90 or try my expensive method .