I cannot click on "Preview and price" - I'm in a country you're currently not shipping to so it maybe a feature more than a bug.
Ok I just added support for 204 additional countries and currencies. Can you try it now and let me know if you're one of them :)
If we can't ship to your country yet the button is disabled so you don't go through the whole flow and hit a dead end. Working on expanding shipping though. Where are you located? Would help me prioritize.
I've added a few requested countries and am adding a bunch more right now. Give me a few minutes and I should have most places that Printful ships to (sorry Russian, UAE and Pakistan)