After all parameters are set up it is time to process the GedCom file.
Go to the page Persons and click on Process GedCom.
The time of the processing will depend on the size of the GedCom file.
For large files it may take minutes ... just be patient ...
When everything goes well and the processing is done, you will see a list of the persons in your database.
Search for your root person with the name XYZ and make sure that this person has the status published.
Also write down the ID of the root person. You will need this in the next step.