Need help for post and blog : I want to do that my post appear on the same page

I have a concern please. I have designed a page that gathers my different posts in a grid format. I would like that when someone clicks on a post, it opens on the same page to allow the reader to select the next article they would like to read from the grid. I have installed The Post Grid to manage this display. Can you help me please? If possible, I can send you the link to the website

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