I found what Chris wrote about this:
Hi Damon, welcome to G2G forum.
This is a help page with very important information:
The next step to import the file is to review your GEDCompare Report.
To review your report click on the link provided on step (2):
. GEDCompare Report: Complete
Your GEDCompare report is ready. Please click here to review it.
To approve your GEDCOM: On your Report's page, scroll down till you find a big green button:
APPROVE: I UNDERSTAND THE INSTRUCTIONS ABOVE AND WANT TO IMPORT
This help page on "Importing a GEDCOM" might also be of interest for you:
Come back to G2G if any other doubt about the process arises.