Computers

Go to the groups main page.
On the right hand side, click on "Membership" - circled in red in the picture.

A box will appear.
Click on "Edit Membership" - circled in red in the picture

A new window will appear.
Click on the pencil icon next to "Identity" - circled in red in the picture

If the email address, your want your messages to be sent to is listed, click on the circle next to it - it has a green circle on the picture.
The black dot should appear next to the email.
 
Click on "Add New Email" if you want to use another email address to choose from - circled in red on the picture
Click on "Save"

If you have clicked on "Add New Email" a new window will appear.
Enter your password and click "Sign In"

Scroll down the page until you see "Manage your email addresses"
click on "Add Another" - circled in red

Type in the new email address in the text box - circled in red
Click on "Save" - circled in green

A new window will appear.
In this case, the new address was a "Gmail" address. It will include whatever provider you use. Click on the "Go to ***" button.
If you click on the "Close" button you will recieve an email to your new email addresss.

Repeat steps 1 through 4
The new email address should be listed in your choices.
If it is not listed then go to the next step

This the email you will recieve. Click on "this link" circled in red.

Click on "Verify Now" if it appears next to the new email address.
If it does not appear, click on the circle next to the new address - circled in red
Click on "Save"