You can see from the left menu , "seller has" "Seller wants" that they list Bitcoin(BTC), now if you are a verified user and make a new offer then you get to trade all reversable ecurrency's of which alertpay is one in this case. So I would create a new offer as seller for "Seller wants" Alertpay and "Seller has" BTC.
The knowledgebase clearly needs some updating since it definitely works with paypal,alertpay,libertyreserve and a couple other ecurrency methods.
Were you actually able to place an offer to sell BTC for Neteller or Alertpay?
Or you just think you are able, but you didn't try it?
To my understanding verified users can trade Alertpay, and other reversible methods, but only if one side of the trade is Liberty Reserve. Liberty Reserve gets escrowed. You can not trade Alertpay with BTC.
When you go to the left menu and select "Seller Has" Bitcoin(BTC), then "Seller wants" gets automatically set to Liberty Reserve. If you then click ""Seller wants" and select "Alertpay", then "Seller Has" gets switched to "Liberty Reserve".
Try to find a single offer in which one of the sides is something else then Liberty Reserve - there are none. Try to make such an offer - if you succeed, send me a link. Up till then I still believe its impossible, even if you are verified.