Hey there!
First off you might need to check if your bank prohibits the use of cards for online
poker sites (I'd say
gambling but to me poker is a game of skill).
Next off, might wanna check if you need to do a verification of your card on the Skrill site.
Hope that helps. Usually it's the first one that was a problem for me. I have two cards, the one issued by Citibank doesn't allow me to make uploads to Skrill but my other card does. So maybe you can check that out first