You can do the sock in the skimmer or put the sock in front of a return... Personally I squeeze the sock fairly frequently to get the CYA into solution. As has been said before, CYA can take a few days to completely dissolve and show up in the test so if you are at 60ppm.. proceed slowly.. there is no rush.
I see another storm is barreling in on Fla, so the rain will dilute your CYA, unless you have an indoor pool. which brings up... can you please put your equipment in your signature? It's provides an easy way to reference your equipment and pool layout when trying to offer advice.