...
When users receive the invitation email, they will need to click the first link in the message. This link contains a special token that will allow them to authenticate and create a user account on the wiki. The link will send the user to fill out the following form:
Once they have done this and clicked, "Sign Up" they should will have just viewing access to the space.
If you would like to add additional permissions for the user to your space simply do the following:
After they do the "Sign Up" tell the person to e-mail the administrator of the page the user name they entered in the form when they signed up, and then you can add them to your Wiki page by:
Going to the Wiki homepage and following these instructions:
1. Within your space, click on the "Browse" drop-down menu, and select "Space Admin"
2. Next, choose the "Permissions" link on the left under the "Security" section
3. Click on the "Edit Permissions" button to modify individual users and type the user name of the person to find them, click "Add" and edit the permissions they have here as well by checking off the appropriate boxes.