As far as I can tell. Tattoos show up on the left side of your body when you get your powers and you can control your powers with your mind. All sirens have powers unique to them and there's only ever six of us in the universe at once. They're also only ever women.
The most I really know is how to use my own powers. The rest. Well I was trying to figure that out but there's not really much to go on.
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The most I really know is how to use my own powers. The rest. Well I was trying to figure that out but there's not really much to go on.