Hey Nonie. I had problems posting as well when first logging in after the forum upgrade. Turns out my device I was using was too old. Luckily I had a newer device available that allows me to post again.
I can see you are able to post the hyperlink to the picture. If you want to continue using your old browser for whatever reason there is a little trick you can try that may allow you to post pictures.
You need to copy and paste the direct url of the picture like usual but between this text with no spaces: [ img ] [ / img ]