This is nice and all, but you can hop to those two places from links in the left-hand navigation.
What I really wanted to do was to get in-boxes from two of my other Gmail accounts into my main Gmail account, and I managed to get it to work with a little tweaking.
Here's how to do it: Step 1: Enable Multiple Inboxes in labs.
Step 3: Go into Forwarding and POP/IMAP and set forwarding to on, and have it send a copy to your primary Gmail address. Step 4: Go back into the settings menu of your primary Gmail account and open the Multiple Inboxes menu.
In each of the panes simply type in "to:" followed by the e-mail address of one of the forwarding accounts.
(Pictured Below) 2B) Click “Add another email address you own.” 2C) Enter the email address that you are trying to “send as” from your Gmail account.
I recommend treating the email address as an alias.
Setting this up allows you to send emails from your main Gmail account and have the sending address be one of your other email addresses.
2A) Navigate to the “Send Mail As” section of Gmail Settings.
2D) Unless you know what your doing and have reason to do otherwise, send the mail through Gmail.
2E) Send the verification to your email address your trying to add to your Gmail.
It seems Google wants to make Inbox the default email app for Gmail.
I'm a fan of the app, though there are a couple of caveats to using it.
In fact, this will become a necessity if Google drops Gmail. Because there will be no built-in email client for IMAP on the Android ecosystem.