Being applied to facts means considering whether or not the premises of an argument are true.
So, for instance, if I made the statement: "If God doesn't exist, then it is not the case that if I pray, my prayers will be answered by God" would you say this is true or untrue? After all, how can my prayers be answered by God if God doesn't exist?
Of course, there is something wrong with this argument. I'm not for one second claiming this proves the existence of God. But when you say that symbolic logic has no meaning until it's applied to facts, I want to know what part of either of the above arguments aren't facts.