Follow the steps below to change or create a new email auto signature for your BES account.
Step 1 : Navigate and open the Messaging application on your Blackberry. The app should contain all your previously stored messages from your BES account.
Step 2 : Now select the Blackberry menu key which can be found to the left of the trackball.
Step 3 : Scroll through the menu that appears and navigate to Options.
Step 4 : Open up Messaging Options from here and navigate to Email Settings.
Step 5 : Here is where you will find the option to change or create your signature. This will be automatically appended to all emails sent using your BES account. Select Yes for Use Auto Signature. Enter the text which you want in your signature here.
Step 6 : Save the changes after exiting from this screen.