Step 1: Forward your Umail to your Gmail Account

You need to make sure your Umail account is forwarding to your Gmail account
http://www.umail.ucsb.edu/usage/forwarding/

Step 2: Add Your Bren Email Address to your Gmail Account

Sign in to Gmail.

Click "Settings" and select the "Accounts and Import" tab

Under "Send mail as", click the "Send mail from another email address" button

In the "Email address" field, enter your name and alternate email address

Choose Use Gmail's servers to send your mail (this is easier to set up)

Click "Next Step >>" and then click "Send Verification". Gmail will send a verification
message to your bren email address to confirm that you own it. Because you
setup your Umail address to forward to your Gmail account, this verification
message will show up in your Gmail inbox as well.

Wait for the message to arrive in your Gmail inbox (may take several minutes)
then click the link in the message Gmail sent or enter the confirmation code
in the Accounts section of your Gmail settings.

Step 3: Decide how you want the Bren email address to behave

Click "Settings" and select the "Accounts and Import" tab

Under "Send mail as", there are two options for "When recieving a message"

Choose the option you prefer.