Select the Wiki tool from the Tool Menu of your site.

You may choose from the following notification options:

• Each time a page is changed in this wiki (or wiki sub-section), send a separate email
• Send me one email per day summarizing all changes in this wiki (or wiki sub-section)
• Do not send me emails when pages change in this wiki (or wiki sub-section)
• (For wiki sub-sections only) Just do the same as for the main wiki notifications

Select the radio button for your desired notification level, and then click Save.