To get started, go to the details page for the order you want, then scroll to the bottom of the page where you attach files and final reports. Click Run Report Precheck.
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The Select Precheck box will now appear. Next, click RUN NVS RULES. 

The Run NVS Rules screen will load and here is where you want to upload (browse or drag & drop) the report you're running a precheck on. 

Once you've uploaded a file the NVS rules will automatically begin running and your results will appear without having to refresh. When the NVS rules all successfully pass, you'll have the ability to submit directly to NVS. How cool!