GS8+ How to set text message signature?

[RitchieD]

How do you add/change a signature block to text messages on galaxy S8/S8+?

[SnowCat19]

Open Messages
Press Menu located at the corner and choose settings
Tap "Add signature to messages” to enable text message signatures, then tap “Edit signature text“.
Type your desired signature, then select ok

[RitchieD]

there is no "Add signature to message" choice

[Ninaxi]

How do you add a signature to text messages on galaxy S8?
there is no "Add signature to message" choice