You need to pull the fender off, or loosen the inner fender and the rear of the fender skirt to reach the spade connector. It's on the end of the blower motor, and there is no easy way to do it. If you find the motor is bad (quite likely), you'll need to take it apart at least that much to make the swap.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching