Posting questions to the forum is quite straight forward:
If you want to answer a question, simply click on the question that you want to answer or comment on.
Note: that an answer should be an actual answer to the question. please use the appropriate comment link to comment on a question or an answer.
This will get you to the page for this question. Scroll to the bottom to get to the answer section.
Questions and answers have a comment link below that allow you to respond to a question or answer in case your response is not an answer to the question: