Yes, you can. To upload your projections, click on the "Projections" tab at the top of the page. On the resulting page, click on the "Upload Projections" button in the middle of the screen.
Click on the "Want instructions?" link for information on how to properly format your projection files. You can upload your projections by either drag the file into the dotted box or by browsing your computer for the file by clicking the "Choose file" button.
After you have uploaded your projections, you can adjust the display name of your projection file. The display name will be referenced on the "Manage Projections" page where you can adjust how your projections and stats are weighted. You can upload up to 5 projection files. Once you're done, you can click the "Manage Projections" button to customize how your Proj FP is calculated.