Welcome Luciano to the community!
So I guess you have an existing Orthanc installation and you want to configure or install the dicomweb plugin for it:
Can you clarify are you working on a windows, linux or docker installation?
If it’s not an existing installation and you instead want to make a new installation there are installation packages which will include all plugins enabled and you don’t really need to separately enable dicomweb.
For example the last installation I did had ohif included and that uses the orthanc dicomweb interface How to install ORTHANC with OHIF viewer on docker