No need to delete anything, just add the images to this thread.
If using Postimage, just click on 'choose images' and you should have a window come up to your image files. When you've selected the image, go to 'Share' and copy and paste the 'Hotlink for forums' code into your post. It may seem daunting at first, but once you've done it a couple of times, it'll be a walk in the park.
Remember by using the 'Preview' feature, you can have as many attempts as you like until you are comfortable that you have it right.