I am trying to create a page that draws on posts with a certain tag. I have experience using a different theme that allowed me to use livemesh shortcode (tag_posts) to do this. How can I do this using this theme?

So I’m trying to remove the “site identity” shadow box in the Header for the “Blog Fever” theme. Can anyone help me with this?

Hello. I am using Blog Fever theme and under the setting reader tab I have it set to show full text on the blog post. However it does not show the full text.

Can you tell me how to have it show full text?
my website page is

https://www.williamdegeest.com is my attempt at a blog and I love the Blog Fever theme but would like to change it a little.
I am brand new to all of this so thanks for your patience and understanding. Two things I would like to change on my blog are being able to use lowercase letters in the Site Title and adding a bar under the title like the one here https://myowndesigns.info/