Hello! Thank you for your question. I am a licensed computer / tablet professional with over ten years of experience, and I will be assisting you today.
I'm sorry about the issue. Do you use the Mail app or another app name? On the iPad, please go to Settings -> Mail, Contacts, Calendar, then scroll down, then select the Signatures option.
If needed, please see the illustrations at the website below:http://www.wikihow.com/Change-the-Email-Signature-on-an-iPad
Please let me know if you still need help with this. Thank you,