How can I give people access to my Wiki to make edits and comment

How can I give my community access to the Wiki site without having to invite them one at a time. I want to be able to copy the Wiki URL into an email, give them the password that I set up for the site, and then send it out to a group of people. I'd like those people to be able to make edits, post comments, etc. This is super frustrating because I've tested the site out on a few people and they can't get access. This is an urgent site to help a friend who's dying od cancer and I need to be able to provide a space for her community to gain access to information about her health and sign up for times they'd be available to help.
 
sad I’m frustrated
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