how do you post your questions in the correct category?

Questions are initially posted in a category by a software program based on key words in your question.

You can change the category if the auto select category is not where you want your Question to be.
Once you submit Click Edit / Edit category...Click All.... find your category and subcategory and submit.

Be aware that Yahoo gave all level 7 users the ability to move any Question to any Category.
Once your Question is submitted is some level 7 users that think having the ability to move Questions anywhere is a new toy to play with.
If you find your question moved.......... You can move it back by clicking Edit / Edit category and moving it back where you want it.

After it posts click Edit and click Edit Category.

Yahoo software puts it in the right category. But some times the software does not get it right and it gets put in the wrong category. If this happens than you self or level 7 user will have to move it to the right category.