Go to the URL sdn.sap.com to land directly on to the SDN forums.
1. Choose the appropriate space (formerly know as forum) for your question by following the menu path as shown below:
2(a): On the overview screen choose Start a discussion for your question as shown below:
2(b): If you're on the content page, it is located on the left side:
3: In the editor you may use the following features mentioned in the screenshot below:
Make use of as many features as possible like screenshots, data files etc., to make your question descriptive, so that the person answering your question does not have to guess all the possible combinations.
As a last note, if you solved your own question please contribute to the community by posting what exactly was wrong with your system configuration and/or how you arrived at the solution and the solution itself.