Re: Need help fast please
Jump from + of your battery to the large cable that goes from the solenoid to the starter itself. If that turns your motor, then your solenoid is probably tired, or connections to it are poor.
Use a heavy gauge cable (booster cable) to make the jump.
....or a faster way; put a large metal (wrench) short across the 2 large terminals on you solenoid. Same thing. Careful not to touch anything else there now! Wear some leather gloves. Expect to be startled by a bit of spark as there are lots of amps if your battery is good. Your welding now, so just do it for a second to see if she turns.
Have fun
Chris