We tried to make OpenKM as intuitive as possible, but an advice is always welcome.
Forum rules: Please, before asking something see the documentation wiki or use the search feature of the forum. And remember we don't have a crystal ball or mental readers, so if you post about an issue tell us which OpenKM are you using and also the browser and operating system version. For more info read How to Report Bugs Effectively.
DICOM feature was only available in professional version but anyway has been deprecated because was based on java applet support in browsers what has no longer exist.
If you are going to work in our source code I suggest you download our development environment ( virtual machine ) what is the easies way to get the application running and apply changes. In our download section you have a video an the download link https://www.openkm.com/en/download.html