I just pour it in the skimmer with the pump on and leave it on for several hours.

Or you can walk around the pool dribbling it in.

Or you can pour it slowly into the return stream.

But no matter what your CYA is, your FC at .4 is definitely too low. I would add a full gallon of bleach and get it up to 5.5 (about) for now.

But get those other tests!

Better still, get your own test kit and run the tests yourself.