Finding a user manual for a Vactric sewing machine may require a bit of research online. This page offers some help in finding one for this uncommon machine.
If you have lost the manual for your sewing machine, it may be useful pick up another one. Often they are available online or can be purchased from an individual selling the manual.
This is a page about finding Coronado sewing machine manuals. Sewing machines purchased second hand or inherited often come without their manuals.