First, you can manually verify it over time, by posting and waiting.

Or, if you need your account verified to post images or links sooner, you can email "fissues" at Microsoft and ask them to verify your account.
In addition, you can post a request in the sticky thread near the top of the list of threads in the Forums Issues forum. Simply open the thread labeled "Verify Your Account #", where # is a number, and reply to the thread with your request.