how to display single image in pop up window?

I would like a single image to pop up in its own window, or enlarge itself on the same page, Within the blog page itself

Currently, a single image opens in the same page on the upper left corner and that’s all one sees on the page.
Blog format is lost.
One must use the browser’s curser to return to blog.

I don’t know html.

Thank you

Jason

https://jasonhoma.com/blog/wp-content/uploads/ngg_featured/jason_homa_jennifer_19.jpg