This isn't a stupid question at all Hope!
When you click on this link -
https://psychcentral.com/ask-the-therapist/ it will take you to the Ask the Therapist page.
On the left hand side you will see, in dark blue "Ask the Therapist" and just down from that will be a link "Learn more about our therapists or Ask a Question now." Highlight and click on the "Ask a Question now." sentence and it will bring you to the submission page to write your question.
Please remember that not all submitted questions get answered and if they do, I don't believe you are not notified about the answer. You just have to keep checking back.