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

[Trinket]

You mean to transfer it inside your local network right? And you have your Raspberry Pi connected to it either via ethernet cable or Wifi dongle?
If that's so, all you need to configure now is Samba sharing. Samba takes care of sharing files inside your network.
You must add the folders you wish to share with the PC to the samba config file which is located in /etc/samba/smb.conf

Terminal

xbian@Raspberry ~ $ cd /etc/samba
xbian@Raspberry /etc/samba $ sudo nano smb.conf

You should now see the config file, assure the following options are set up correctly:

PHP Code:

workgroup = WORKGROUP 
interfaces = 127.0.0.0/8 eth0
bind interfaces only = true
security = share
guest account = nobody 


Make sure "WORKGROUP" is the same as your windows workgroup, the interfaces option sets which type of connection it allows, if you use a ethernet cable it should be fine with that, you can also restrict it to your local ip by adding "192.168.1." where that should be your default gateway (without fixing the last numbers).
The security is set so as anyone with access to the local network can access it, if you wish I can show you how to require a user and password to access the share.
To add a folder to the share append the following to the end of the file:

PHP Code:

[Guest Share]
        comment = Guest access share
        path = /path/to/dir/to/share
        browseable = yes
        read only = yes
        guest ok = yes 


Once done you must restart the samba server on the raspberry pi with the following command:

Terminal

sudo service samba restart

Hope it helps!