How to fix blog post, show content summary duplicate

Here is a link to my page

all my blog posts, show the summary 2 times, and then show the actual post. please help me fix this.

also, it does not show the featured image on the top of the actual post, how does it add the image?

lastly, i need my posts to be evergreen, so how do we remove the dates on the post, and all post and pages on the Fixer Theme?