There isnt an exact way to add a signature at the end of the txt. In order to do so, you have to create a template with your signature, then insert the template at the end of your txt. However, know that it will count towards the 160 character limit. Instruction from the user manual (pg 38-39) below. Hope it helps!
Message templates
When you often use the same phrases, you can save the message under template messages. Adding the message as a template
Sending a message with template
note: You can add a template while writing message. Write a message > Options > Add Template. Choose Text or Multimedia and select the message to add.
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