Hi, how can i delete finished .torrent files from hard drive? But just them, not downloaded content?

-"Settings -> Transfers -> Local Files" gives you the necessary options to control how Tixati handles local files on your hard drive;

-"Settings -> Transfers -> Meta-Info" lets you specify how .torrent files are handled by the program;

-The "Remove" button on the top of your Tixati Window lets you either remove a torrent's entry from the transfers list, or the local files themselves.

It's all a matter of exploring the options and experimenting to what suits you best. Personally, I don't even bother letting downloads create .torrent files at all (they're not needed unless you have a specific use for them).

Another option when downloading them is to choose open with instead of saving them. Then you never have to deal with them they are only read by Tixati but are never saved except in a temp file which will be cleaned.
If you need to save them then go to settings meta-info and look at the options there.