Where to find SEAFOAM?

this might be a dumb question but how do you use it? drop it in your gas tank?

1/3 of the can goes to your intake (either a vacuum hose to tb or maybe pcv tube, I just used a bypass vacuum which lead directly to the throttle body).
1/3 goes to gas tank.
Remaining 1/3 goes to your oil (just pour through oil cap)

It’s a petroleum product, so it’s safe for all three.