How To Add Your Truman Custom Signature For Mac OS X
From the Mail menu, choose Preferences.
Click on the Signatures tab.
Click on your email account in the left pane. If you have multiple accounts set up, make sure you select your Truman account.
Click the + button under the middle pane and give your signature a name.
Delete the default text in the right pane, then paste in the text you copied from the Truman Custom Signature Form. You will probably see a question mark instead of the Truman logo – this is okay and will not show up in the actual email.