There are a couple of ways to do it, but for me the easiest is hosting on Imgur and hotlinking them here.

There is a guide here, it's a little outdated as Imgur keep pushing to become a full social media site, but you can just keep it all provate and use it as a hosting service still.

https://www.buildyourownguitar.com.a...ead.php?t=8108

You can also use the forum uploader but image size needs to be less than 1mb and 1500px across. Plus you can only put 5 images in your post that way.