Welcome members, to the Journal Page #10 Challenge!
If you can decode and answer all three of these riddles, you'll receive a printer friendly version of my private notes on Dipper's Guide to the Unexplained #23: Grunkle Stan's Tattoo for your very own Journal! That way all the members of the Royal Order of the Holy Mackerel can build their own update-able Journal to keep track of all of the secrets of Gravity Falls!
KEY: D=1 A=F
HINT: IF YOU'RE STUCK, TRY REWATCHING THE EPISODES OR CONSULT THE GRAVITY FALLS WIKI!