what do I do now that iWeb has been canceled?

iWeb was cancelled in 2012.

”On June 30, 2012 Apple finally pulled the plug on MobileMe. All iWeb websites hosted on MobileMe disappeared if not hosted elsewhere. Apple provided instructions of how to move iWeb sites to another host.”

https://en.wikipedia.org/wiki/IWeb

iWeb doesn’t work on the latest OS.

You either have to use an OS that still supports iWeb or look for alternative web creation apps.

Look down the page with topics that deal with this question.

People are recommending EverWeb, also known as iWeb Pro.

Site123 is also good. You could check that out.