Midi-channel-filter: How to put the modified py-file on the raspberry pie?

Hello,
I´m a software-noob. Sorry if I ask a weird question, but I did my best to find an answer to my questions somewhere else.
I built the samplerbox and downloaded the image and everything is working fine. Now I modified the py-file from the manual-link to build in a midi-channel-filter.
But how do I get the modified code on the Raspberry 2? Can I copy-and-paste it somehow into the mini-sd, or do I have to create somehow a new image?
Thank you very much for your patience.
Nick

P.S.: I don´t have a monitor, so if there is a way to put it on the card it would be awesome. If not, i have to rent one.

You can upload a new file by sftp if you use linux or mozzilla FTP on windows. Befor uploading you must to pur filesyste in read write mode

Regards mirco

Thank you! It works :)

Great .....