First, you'll need to open app/design/frontend/quasar_free/default/template/catalog/product/productview-description.phtml and add a new tab. So around line 50 you'll see the <ul>, so add around line 72, just before the closing </ul>, a <li> for the new tab like:
Then you'll need to remove the original upsell call from app/design/frontend/base/default/template/catalog/product/view.phtml on line 166.
Untested but should work.
STEP 1 IN MAGENTO DEVELOPMENT - DISABLE YOUR CACHE OR YOU WON'T SEE ANY CHANGES.
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Check the
"Useful Snippets"
post for tips.