When you are ready to can, prepare the pressure canner by adding water to the level recommended by the manufacturer. (This is usually 2 to 3" of water.) Turn the heat to medium so it will start warming up.
Fill clean jars about 1/3 to 1/2 with water & place in the pressure canner (to help them heat up and stay hot) or keep the jars hot in a dishwasher.
Rinse the shelled beans with cool water, then carefully put them into a pot of boiling water.
Boil a pot of water, then add the beans to the pot. Return to a full boil, then boil for 3 minutes. At this point, you can remove from heat, cover pot, and soak for 30 minutes to one hour IF you're extra concerned about phytic acid and lectins. (Though pressure canning for such a long time does destroy many, or perhaps all of those.) OR The way I initially learned to can fresh beans the "old timer way", we didn't soak for one hour after boiling. (I've done both ways & they both result in tender, digestible beans.)
Place the canner on a burner and turn to medium, so it and the jars can start heating up. It doesn’t need to come to a boil, but should be nice and hot.
Drain the beans, and discard the cooking/soaking water. Rinse the beans lightly with fresh water.
Remove the hot jars from the pressure canner (discarding the extra water in each jar down into the sink) or from your dishwasher. Fill the jars up to the shoulder area with beans. (Don't overfill!)
Place the salt in each jar. (1/2 tsp for pint jars; 1 tsp for quart jars)
Add hot water into the jars, until the water reaches a 1-inch headspace. (This is just below the bottom line at the top of the canning jar.)
Slide a chopstick or skewer down the sides of the jar a few times, to remove air bubbles. If needed, you can adjust the water level again.
Wipe the rims of the jar with a damp paper towel, then apply the lid and ring.
Set the filled jars down into your pressure canner, tighten the lid, place over high heat until a steady stream of steam comes out of the vent pipe for 10 minutes, or however long the manufacturer suggests.
Check the notes for specific processing times & pressures (but it's generally 75 minutes for pint jars and 90 minutes for quart jars)