Here are the basic steps:
- Create a blog at blogger.com.
- Under SETTINGS tab, select PERMISSIONS.
- Select the ADD AUTHORS button and add the Google Username of anyone you'd like to give permission to post on the blog.
- Under the DESIGN tab, select ADD A GADGET wherever you'd like their email input box to appear.
- When the gadget window pops open, select FOLLOW BY EMAIL and it will be added to the blog.
It's as simple as that!