If you have a complete gamelog, click the Browse button to locate the file, make sure the correct year and week are selected (the week you enter should be the same as the week the game occurred, you don't have to deal with 0 being week 1, etc.) and click Upload.
Uploading a gamelog will:
1. Import all the game stats for that game
2. Update the schedules table with the results
3. Update the standings table with the results