How to change things on the blog?

On my Astra theme site blog page it shows all my posts.

Example…….

My Most Popular Railway Photograph

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My Most Popular Railway Photograph If you put one of your latest railway photographs on social media, you will hope that people will like it. I have just recently done this and I was surprised at the results within a week. The photograph below is what I took on the 30th August 2021 and I …

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How can I do the following things…….

1. Remove – My Most Popular Railway Photograph title from the paragraph.

2. Change the last line in the paragraph so it ends with a full stop.

Thank you.

The page I need help with: [log in to see the link]