Go to the settings tab and under the Page URL and where you see http://offers.enduraplas.com it should be a dropdown list where you can select from the domains you have setup in Hubspot.
It looks like you have HubSpot blog tools assigned to blog.endurapls.com and its landing page tools assigned to offers.enduraplas.com - which is a common config.
In this scenario, it’s not possible to publish your topics page to the blog domain since you can’t publish a bespoke page inside the blog tool.
The way around this is to change your domain configuration so that both the blog and landing page tools are assigned to the same subdomain. Then you could add /blog/ to the URL of your topics page and it would appear to be part of the blog.