which demon should i call for power?

need help on summoning my demon i got 1 candle the color of my demon and 2 blue candles since i couldnt get black. i drew the sigil of my demon on a peice of paper then i chanted the name of my choosen demon in my mind and out loud. Am i not reading the signs right or do i need to meditate more...

need help on summoning my goatia demon