Changes needed in our opensource ''lenmus.org''(repost)(repost)(repost)

I would like to make changes to the [login to view URL] open source software and would like it rebranded as well. I'd like to add a license key or registration part when someone downloads and installs the software, without it the program must not work. I'd like to add a section called "Memorization Tools" with a few embedded video files. I'd like the program to remember settings and defaults. The user should not be asked repeatedly about audio channels, etc as currently happens with it. I'd also like to add to or change about 20 pages of the material in the course. I'll provide all the new content and advise where to put it, but you'll be responsible for the coding of it. I'd like to remove the "what's new at lenmus" and "visit lenmus website" options in the start page. Lastly, I'd like to add a "getting started" guide and step-by-step instructions for how to best use the program (about 3-5 pages and accompanying audio). All changes and the resulting final piece of software must be compatible with Mac, Linux and Windows computers.