When asking a question online it is important to have a good title for your post and include details in the body of your question but also leave out irrelevant information. Be sure to not just asking how to accomplish something, but also state why you need to do it so the question can be answered properly. Also be sure to follow up and state what worked when your problem is solved.
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Here's how to remove the background from an image using the Preview app that comes with macOS. The Smart Lasso tool does a so-so job, but it is useful to know how to use it in case you only occasionally need to do this and don't wish to purchase another app to edit images.
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Here's how to remove the background from an image using Affinity Photo. You can use this to blur the background or replace it.
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The Mac app Pixelmator Pro has a variety of tools for removing the background of a photo. The best method is combining the Select Subject tool and then refining the selection with Quick Selection. You can use this to blur the background or replace it.
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Screen Zoom allows you to zoom in on a portion of the screen to see the images or text there when they are too small otherwise.
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