If your computer has a default setting to not allow notifications or you accidentally clicked disallow when trying to set up your notifications in Enji, the button to toggle notifications won't be live. Here is what you need to do to change the site setting in your browser to fix this.
Change the site settings for Enji in Safari
Click on Safari in the menu bar on your computer
Click on Preferences, then Websites in the options you see across the top of the window
Find Enji and change to "On"
Change the site settings for Enji in Chrome
Click on the "View Site Information" icon (it looks like 2 horizontal lines with 2 dots)
Click on site settings
Find "Notifications" and set to "Allow"