iPhone how do i add signature?

i jailbroke my iphone 4s and i installed the app sms signature i input my signature but when sending a text the signature isn't showing under what are other sms apps that will allow me to send a text from my phone not those other apps that you have to use to send texts from sms app itself

 

Thanks i was asking is there an app that a signature can be added through settings instead of using an app like bite sms that adds the signature the app itself