How can I import a GEDCOM file ?
See my contribution athttps://www.geni.com/projects/Connecting-to-the-Big-Tree/17983#Why-can-t-I-just-upload-my-GEDCOM-file
This contains a link to the new version of the GEDCOM import method, which takes account of the fact that many of the people in your GEDCOM file are probably in the Whole World Tree at Geni already. You don't want to import them again, for the reasons that I give at the link above.
I also describe the method that I find easier to use, SmartCopy.