The easiest way to solve this is to use the online Sell Your Item form for one listing (Turbo Lister won't bring up the agreement you need to accept, so will just block your listings, but the online form should prompt the agreement to pop up - after that, you should be able to use international postage options via Turbo Lister).

The agreement is basically to comply with international sites' terms of use, which more specifically means that you need to comply with the terms and conditions of eBay buyer protection that's offered on other sites, which is worth reading up on so you know what you'll be agreeing to: http://pages.ebay.com/help/policies/buyer-protection.html