An email is sent to a Member once they register for a Level. This includes their account info, etc.
The New Member Registration Email is sent either on a Global Default or Per Level basis.
The global default New Member Registration email WishList Member sends when a member joins a Level can be found in the Advanced Options > Global Defaults > Email section of WishList Member
This will be sent to all New Members when they register for any Level.
If you want to set a specific email for each Level, the Per Level option is explained below.
There is an option to send a specific New Member Registration Email for each Level.
This will allow for the option of a different email for each Level.
This is located in the Setup > Levels > *Click on Level Name* > Email Notifications section.
This is also touched on in the Levels tutorial video around the 18:45 mark