I have a new Blackberry Curve 8900. I bought a Blackberry app for $1.99; it arrived okay onto my desktop, but I don't know how to get it onto my BB. It's a .jad file, if that helps.

I can't even open it on my desktop.

Please walk me through the steps that are necessary to get it onto my BB.

Thanks.

transfer to media card and install on bb

JAD files are normally used for Over The Air downloads...

Have you tried to browse through Application Loader.
JAD files are usually downloaded directly on the handset and not on the PC