how to thread pfaff sewing machine

{"cid":"91220595","title":"CE RoHS Certified UFR-787 Industrial Sewing Machine Speed and Max. Sewing Thickness","imgUrl":"https:\/\/img.chinax.com\/nimg\/2a\/cc\/d11124546ff3837a9bd9d2968a9e-200x200-1.jpg","attrs":{"Price":"$80.00\/sets 100-499 sets","Brand Name":"UKICRA","Model Number":"UFR-787","Minimum Order Quantity":"100 sets","Max. Sewing Speed":"360","Condition":"New","Place of Origin":"Guangdong, China","Type":"Industrial Sewing Machine","Stitch Formation":"Lock Stitch","Mechanical Configuration":"Flat-Bed","Max. Sewing Thickness":"0.3mm-1.8mm","Stitch Length":"1-5MM","Power":"36W","Overall Dimensions":"430X190X315","Feed Mechanism":"Walking Foot","After-sales Service Provided":"Engineers available to service machinery overseas","Certification":"ISO9001,CE,ROHS","Packaging Details":"1pc sewing machine packed in a polybag, then protected by foam, the sewing machine and its accessories packed in a color box, 528pcs in a 20GP","Port":"SHENZHEN","Supply Ability":"20000 Set\/Sets per Month"}}