where can i get a jones 942 sewing machine manual?

Trying to thread a jones 942 sewing machine, was given machine already threaded but since trying to change bobbin, thread keeps coming out of needle when i try to sew a quilt cover for my babies cot. I have tried threading machine all different ways, donot know what i am doing wrong, donot think I am threading it right, not sure what all the number dials are either or what number they should be on. I always used an very old singer sewing machine. Can someone please help?