hi!
it seems like you ended up in the right place but just so future readers are aware, the preferred address is “https://make.bitsy.org/“
the address you originally posted “http://www.make.bitsy.org/“ should also be ok, but your browser may warn you against visiting it because you left out the “s” in “https” (this means your connection to the site will not be as secure)
(if you see anything concerning again when visiting one of the bitsy sites, please post a screenshot here and I’ll be happy to take a look to see if there’s a problem)