I cannot figure out how to submit images for a critique.
There is a page that says submit them here in red print. There does not seem to be a way to submit.
If you're asking about getting other contributors to comment on your images, I think you want the other forum here
In the above forum, you start a topic and then can either upload an image from your computer or provide a link to another location online.
Sheena's link above will help you if you were talking about submitting images to be reviewed for sale on Adobe Stock