The blue candle is given to you by the corn farmer to the right of the covered bridge. You will need to help him with his bug problem by bringing him a chicken.
Get the doubloon that the girl has thrown into the river, and buy some chicken feed at the Store. Give this to the boy with the chickens, and he will give you one.
You have to get the chicken and you go to the farmer's house, use the chicken, and one of the farmer's family members or farmer gives you the blue candle. ( I can be wrong too. I haven't played Skullduggery in a while)
you go to the tower and signal the man on the raft to shore using the mirror which you can get at the general store.when he comes he tells you that you can have his raft and you try to beat captain crawfish.
Take it to the Governor's house, where its light will reveal the faded writing on the Parchment letter.
give it to the dude in the mansion
Use your raft to sail to Golden Harbor.
When you have the blue candle, go to the governor's house (far right).
Take the blue candle and go right, to the governor's house. You can use the candle to read a faded document.
The blue candle reveals the writing on the parchment, which explains how the treasure map was divided.
Take it to the Governor's house to the right of the farm. The governor has a parchment that has partly faded. Use the blue candle to reveal the hidden part of the text.
At the Governor's Mansion (far right), you use it to read the faded writing on an old parchment.
Take the chicken to the farm at the right of the bridge. Use it to eat the bugs and the farmer will give you a special blue candle.
The Governor's house is on a hill at the far right of Fort Ridley island. Go there when you have the Blue Candle, so that you can read the parchment and begin the sailing quest.
At the Governor's house, you can use it to read the missing part of the parchment.
Take it to the corn farm to the right of the bridge, where it will eat some pesky bugs. The farmer will give you the blue candle, which you can later use at the Governor's house.
To read the document at the Governor's house, you need a blue candle. Get the doubloon under the right side of the bridge, buy some feed at the store, and give it to the boy with the chickens outside. He will give you a chicken. Give the chicken to the farmer (right of the bridge), he will give you his blue candle.
Once you have used the blue candle to see the governor's document, a raft will be visible from the tower telescope. Get the broken mirror from the general store and signal to it.