Foxesrule wrote:Ah, Ok, thank you!

EDIT: I've tried double clicking as well as left and right but it dosen't play music, and my line just stays where it is.
Okay, so when you equipped it fully, you sit in a boat or stand at a shore with fishies jumping out of the water (actual animation). You go to adventure > fishing. When you select that, your cursor will become a fishing line, left click with it next to you on the deep water with fishies.
You'll see your line in the water and music playing. After about 15-ish seconds, you should be getting a fish in your inventory.