There are a few ways to insert JPEG images online:
1. Use an image hosting service like Imgur or Photobucket. Simply upload your image to the service and then copy and paste the provided code into your HTML editor.
2. Use a WordPress plugin like WP Smush. This plugin automatically optimizes images as you upload them, making them smaller in size and therefore faster to load on your website.
3. Use inline CSS. This method involves adding a small amount of CSS code to your HTML document that points to the location of your JPEG image file.