There are several ways you can get help if you are at a loss about fixing the bug that's blocking you.
First of all you should try the general English mailing list. If you are sure it's a bug in the TYPO3 v4 source code, you may also try to get answers from the general Development mailing list.
If you have found a patch in an existing bug entry, don't hesitate to test it. If the patch has already been submitted to the TYPO3 v4 Core mailing list you may vote for it (see the Core mailing list rules). If not you are welcome to submit the patch on behalf of the original developer (again refer to the Core mailing list rules).
Another possibility is to try and find a developer willing to fix the bug for a fee. The general mailing list is a good place to make such offers.