If you wish to continue posting images to the site, but you don't want to have to pay to reduce the size of your images, you can always invest in a cheap photo editing programme which will reduce the size of your image to whatever you want. Or there are plenty of free one that can be found on the web, and windows 10 has photo editing facilities built into it.
Just remember you can't post a photo larger than 80kb and the total of images (no more than 5) can total no more than 192kb. If you have problems just outline your problem here and either Roy, Chris or myself will try to assist you.