Edit standard modules widget text in help center

Edit standard modules widget text in help center

Hi,
I'm trying to edit the standard module text widget in help center, but I can't see html/css sections like for header and footer.
How can I edit it?
I need to edit "Browse through our collection of articles, user guides and FAQs." and "View your previous tickets; know their statuses and solutions."
I have to edit the bottom section with the question: "Still can’t find an answer?
Send us a ticket and we will get back to you."
Thanks