The short, no frills answer:
Let the frozen wort thaw and come up to room temp.
Let the yeast in the mason jar come up to room temp. Pour off most of the liquid from the yeast jar, leave just enough so you can swirl the yeast up and make it "pourable".
Depending on what kind of container the wort is in, you may want to transfer it to a larger sanitized vessel, like a growler or something.
One way or the other, pour the yeast into the thawed room temperature wort. Cover the top of the container with some sanitized tin foil. Shake and swirl as often as you can. Leave at room temp. Pitch into beer between 24 - 48 hours after you initially mix it.