To upload a file to VirusTotal, you can visit the home site and use the main file scan form. You can make this process even easier with the free VirusTotal Uploader utility. After installing it, you can simply right-click any file under 32MB and choose VirusTotal from the Send To Windows menu. The scan results will be displayed in your browser as usual.
Sending files to VirusTotal
With VirusTotal uploader this task could not be easier, just right-click on the file you wish to upload and select the VirusTotal option from the Send To context menu: