Yes, it is possible to edit a process once it is activated. However, there are some caveats that you should be aware of before attempting to do so.
First, you should only attempt to edit a process if you are absolutely sure that you know what you're doing. Making even a small change to a process can have unforeseen and potentially undesirable consequences.
Second, even if you are confident in your ability to edit the process, it is always best to make a backup copy of the original process before making any changes. That way, if something does go wrong, you can always revert back to the original version.
Finally, keep in mind that editing a process is not something that can be easily undone. Once you save your changes, they will be permanent. So again, only attempt to edit a process if you are absolutely sure that you know what you're doing and are prepared to live with the results.