Well, this looks like another old recipe.
From what you've indicated, it sounds like you heated the must, but didn't stir to oxygenate after heating.
To simplify, it sounds like your method was heat & skim, chill, pitch yeast, airlock immediately.
Primary fermentation requires oxygen. You should stir or otherwise oxygenate the must prior to yeast inoculation.
I don't often use Red Star yeasts, and you didn't indicate your rehydration method. There might have been a problem there too. It is possible that your yeast was not viable from the start.
Acid blend... there has been a wealth of discussion on why that isn't necessary and is potentially harmful to your fermentation.
I'm assuming that it was a 1 gallon batch. You'll be making a very dry mead.
To fix this, you may want to rack it back into a primary bucket, oxygenate and re-pitch your yeast.
David