If you think you found a bug and there is no bugreport about it, then
create a bugreport about it in the bugtracker so it can be fixed.
Go to the bugtracker.
For getting the latest sourcecode, clone the git reposity with the following command:
git clone https://github.com/NoteFly/NoteFly.git NoteFly
You can also get the sourcecode as a zip archive of the current release
on the download page.