You can't upload a replay here. Upload it to
http://www.wotreplays.com and then link. Or use Active Dossier Uploader from
http://www.vbaddict.net and turn on the upload replays option there - it will upload your dossier after each game and attach the replay for it, plus track a load of stats that aren't available in the API. I gave up on WoT Statistics ages ago as it has a lot of bugs, ADU is much better and rarely needs updates as the data is uploaded to the hosting website and processed there, not on your own PC.
I should have my stats page up and working in a few days, and it'll have some more stats that were added to the signature code too. At some point I need to pull out all the API code into a reusable include that is shared between both the signature generator and the stats page, but I haven't had chance to sort that out yet.