how to use Rafflecopter

I have used Rafflecopter before on my blog to do giveaways with, however whenever I use the HTML code provided a link only shows up. There should be the Rafflecopter box on my blog instead of just a link. I have been just copying and pasting the link into the text box of my blogpost. Does anyone know if there is a way to have the picture show up using an HTML code? Help much appreciated.