I think this is great. I love this.
I immediately went to the menu to see how I could buy a subscription, and there isn’t a place, as far as I can tell through my search, to do so.
This goes for all new startups (non-profit or not!) if you want me to give you money, make it easy for me to give you money.
This is an online magazine, ostensibly, and as such I would expect to see a “subscribe” page, which would take payment information, and I would get emailed new issues as they come out.
There's an RSS feed that is exposed in the standard manner (link tag in head), precisely what you're looking for. They do not offer a paid subscription, just the option to 'buy' individual issues, which is also linked under every issue.
if you're asking "how do i easily buy prints", that's under the prints link atop, and you'll ultimately end up at lulu
https://pagedout.institute/?page=prints.php
https://www.lulu.com/search?contributor=Paged+Out%21+Institu...
I discovered it easily on desktop, idk about mobile
If you want to support them now you can order prints. They have a sponsorship edition that costs extra if you want to extra support them.
https://www.lulu.com/spotlight/pagedout