How to make personalized signature for SMS?

The method of adding SMS signature to mobile phone is as follows:

Mode 1. Information-Menu key (three dot icons in the upper right corner)-Settings-Signature-Open the slider in the upper right corner, and green means Open-Edit the signature.

Mode 2. Information-Menu Key-Settings-Check "Add Signature"-Click "Signature Text"-Write down the required signature.

note:

1. The recently listed machine does not support the SMS signature function.

2. The operation paths of different models of mobile phones may be slightly different.