How to connect to a Pi /w Xbian using FTP?

[Steffko]

Hi there. I'm sort of new to the Raspberry Pi, installed Xbian and now I tried to get a connected (via FTP or however) to my Pi to copy stuff from my PC to either the SD card or a connected USB stick. I know I can stream the content (and that's working just fine), but I'd like to have it on the device.
I hope you can help me out a bit. I'm just some random Windows user, so please be patient