I want 2 currncies on my site

I buy the plug in today.
1. I Install the plugin. OK
2. I Config the plugin. OK
3. I put 2 currencies on the website one is USD and the other is COP.

I can see the 2 prices if I use the currency price switcher or the side bar, but I want the price show automatic, the plugin can do that?
I don´t want my clients see the 2 prices because they are different for each currency.

Thanks a lot.