Did you mean..you want to do signature at your Gmail?
1. Log on to your Gmail Account.
2. Select "Settings" in the upper right corner of the page.
3. Enter your preferred signature text in the box next to the "Signature" option (typing text into that box will automatically turn on the signature option).
4. Select "Save Changes" to confirm your signature.
at yet,i did not clear this question.,if you have problems still.,please write second round.