The My Stats page on Tier7 shows you your most recent matches as well as how well you're performing with different heroes. If nothing is showing up here, try the following troubleshooting steps:
Update HDT to the latest version. Go to Options > Tracker > Settings > Check for Updates to make sure you've got the latest version installed.
Log in to the proper HSReplay.net account in HDT. You'll find this under Options > HSReplay.net > My Account
Make sure your Battlegrounds games are set to sync with your account. You'll find this under Options > HSReplay.net > Replays > Battlegrounds.
The My Stats should usually update immediately but may take a few minutes in extreme cases. If nothing appears after visiting the page multiple times and you've tried all the steps above, reach out to us through a support ticket so we can look into your account further.