How to update my iOS

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

Why did you tell us you wanted iOS 13 or iOS 14? They are not available.

Did you read the message at the bottom of the screenshot?

You have no Wi-Fi connection on your phone. The update will not run until you have a good Wi-Fi connection

iPhone SE but iOS Update it comes 15.1

Update iOS 14

I need iOS 13

You have an iPhone 6.

iOS 12.5.7 was the final update for the iPhone 6. No more updates are available.