Editing the blog post template for Spirit Theme

Hi

I need to edit the appearance of the individual bog post appearance on my site to remove the featured image from the page, the page title (just on the individual posts not the list of all posts) and the author. Where and how do I do this?

I have been able to edit the page that lists all posts as the controls for this are easily available but I seem unable to find the relevant settings for the individual posts.

Also when I open the individual pages in the Upfront editor I get the following message, and also when I attempt to make any changes.

Thanks

AJ