Detailed information and install instructions can be found on MyAnimeList.
The fastest way to contact me is through the respective forum thread (preferred) or my MAL profile. You can open an Issue here on GitHub, but I do not check here very often and may take a while to respond.
If you have design or feature feedback about Clarity, 9anime, or Tilt, you should know these themes have been essentially feature-frozen. Due to how I had users install them (with auto-update functionality), I am hesitant to release anything beyond simple bug fixes. If you have feedback on any other theme, I will take it into consideration.
Feel free to modify and use any of these themes however you wish to. My one request is that you do not claim credit for the original themes. I do not mind if you take snippets of code to create something new. Code being reused is commonplace; If the visible output is noticeably different, that's all that matters.