A really stupid question about loading a data bundle onto a tablet

I have a Motorola Xoom and I have an Edgars application with which I can purchase data bundles (never tried). My question is how do you get it onto the Xoom without removing the sim and putting the sim into a phone to load the bundle?

Never done any of this before.

Ps the Edgars application in on my blackberry just to be clear.