I recently made a post about it, you just need to follow these steps:

• Step 1: Upload your image to site like https://imgur.com/. Then right click on the image to Copy Image Address/Location. You will get some link like this: https://i.imgur.com/lUr20xA.jpg
• Step 2: Use the following code in your post, your image will show:
  

This is what you will see after you insert the above code in your post:
https://i.imgur.com/lUr20xA.jpg

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HOW TO RESIZE YOUR IMAGE?

You can add width and height to the code to resize image, the code will look like this:

What you will see after resizing:
https://i.imgur.com/lUr20xA.jpg

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HOW TO MAKE THE IMAGE CLICKABLE?

If you want your image to be clickable (once click redirect to another website), you can use the following code in your post:


This way once you click the image, it will take you to another website (in my example bitcointalk homepage). You can try below:

http://i.imgur.com/lUr20xA.jpg



Note:
- Newbie CANNOT post image.
- imgur link MUST have a jpg/jpeg/png extension. Also link to an album in imgur will result in proxy error.