Tixati is a bittorrent client. there is no "site" involved to upload files to. Files remain on your computer for sharing into a decentalized p2p network.
Click the "Discover" tab on the tixati homepage for help understanding the difference.
When you add content to your tixati client to share, it will be made available for others using bittorrent clients such as tixati to download and re-share.