In order to create your own custom signature to be added at the bottom of each of your outgoing e-mails, you'll first need to select "Options" from the "Tools" menu.

STEP II:

When the "Options" window pops up, you'll want to select the "Mail Format" tab. While in the "Mail Format" tab, click on the "Signature Picker" button in the "Signature" section.

STEP III:

In the "Signature Picker" window, click the "New..." button.

STEP IV:

Type the name that you would like to refer to your new signature by in the field provided under "Enter a name for your new signature:". When you're done, click the "Next" button.

STEP V:

In the field provided, type in the signature that you would like to be included at the bottom of all your e-mails, when you are finished, click the "Finish" button.

STEP VI:

Back at the "Signature Picker" window, click the "OK" button to indicate that you want to set your new signature as the default signature for your e-mail messages.

STEP VII:

To finish the process, click the "Apply" button, and then the "OK" button.