HumHub php code edit


I have been assigned a task and I need help. I gotta edit the php code of a website’s dashboard. I have been working on cpanel. There is a folder that I’m supposed to look into in order to find the file that I’m supposed to edit. However, I’m unable to locate it. The file is in the file manager in cpanel. How do I trace the website’s dashboard’s code in the file manager?Any idea? Can someone help me? Thanks in advance