To add external users to your SharePoint project or any other site, click the “Share” button at the top right of any page on your site.
In the pop-up window, on the default tab “Invite people”, enter email address(es) of the person(s) you want to invite and make sure checkbox “Send an email invitation” is checked.
You should check to which group and permission level these new users will be added, as you probably don’t want an external user to have “Full Control” permission level. By default, SharePoint selects the “Members” group, with “Contribute” permission level.
When you have entered all this data, click the “Share” button.
After this action, at the top right corner you will see a notification confirming your invitation.
After the invitation was accepted, if you click the “Share” button on your website again, you will see this person’s name at the top of the pop-up.
Also, if you go to Site Settings -> Users and Permissions -> People and Groups and you select a group to which you have added new users, you can see that this person’s name is in the list, just like any other “regular” member’s name. (Check out the 3 screenshots bellow.)
In the next post, I will show what this experience looks like for the person you invited to join the website.