Hey Ray, no worries. We’re pretty easy going. All the guidelines and help can be found in the “About” section in the top navigation; there you’ll find the “FAQ/Guidelines”
And yes, it’s 1 image per day - per category. It’s not so strict, for example, I just posted 3 images yesterday. So it’s ok to post variations of the same scene if you’re wanting feedback on processing, c rops, etc. But the main thing we’re trying to avoid is like where on other image posting sites, you can post as many images as you want! You get a bunch of ‘likes’ and wooo-hooo… but here we’re focused on critiques and critical feedback - and not ‘likes’. 
Hope that all makes sense!