I have used Google Sites to set up a wiki and now want to allow three other people to be able to contribute to the wiki (full edit permission).
Do they all need to have a Google account and do I need to know which email they use to log in to their Google account to be able to grant them this permission?
So I go to the site's Sharing and Permissions page, there's a place where you can Add people and assign rights. The box says, "Enter names, email addresses, or groups...".
If I know my friend's email address, can I just enter
email@example.com or do I have to contact her first to get the email she uses to log into Google?