I can’t change the /blog in my Permalink structure

I can’t change the /blog in my Permalink structure. I want to have my post name without /blog in it. How can I do this?

[https://drive.google.com/file/d/14pxYayWBdp3SABySZ8UicJoGkBQRy\_jN/view?usp=sharing](https://drive.google.com/file/d/14pxYayWBdp3SABySZ8UicJoGkBQRy_jN/view?usp=sharing)

 

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