Use the contact us link at the bottom of the page once you log in. I had two transactions and had to send two separate emails to get my funds released.
Here is what they sent me:
Your payments will not be held if you meet all the following
requirements:
* Your eBay tenure is more than 6 months.
* Your eBay feedback rating is over 100.
* Your buyer dissatisfaction is less than 5%.
Or if you meet all the following requirements:
* Your Detailed Seller Rating is greater than 4.5.
* Total Detailed Seller Ratings Received: More than 20 in the last
12-months.
* Your buyer Dissatisfaction less than 5%.
If you have had more than 5% dissatisfied buyers in the last 30 days,
you are required to offer PayPal or a merchant credit card.
These requirements are per individual eBay account. If you don't meet
this criteria yet, we recommend that you implement best practices to
reduce buyer disputes, claims and chargebacks.
We appreciate your patience and understanding regarding this matter, and
wish you continued success on PayPal.