Signature settings I am unable to add signature in my SMS settings.

It Quite easy to add Signature or logo to Your Email account ,
Simply Go to the setting
and add the image or logo to your account

For more use this article: http://livetechniciansfor4.blogspot.in/2016/11/explaining-way-to-add-email-signature.html

Add a signature to your text messages using these steps.

1. Open the "Messaging" apps.
2. Press the "Menu" located at the upper-right corner of the screen.
3. Choose "Settings".
4. Tap "Add signature to messages" to enable text message signatures, then tap "Edit signature text".
5. Type your desired signature, then select "OK".

Your signature will now be automatically added to each text message you send.

Otherwise, you can use applications from the Google Play Store - SMS Signature is a good one to try!

Actually it does, see below:
To add a signature to each sent message:
1. Select OK > Messaging > Settings > Text Messaging.
2. Highlight the Add Signature field.
3. To have your phone add your name to each text message, select On.
- or -
To have your phone add a custom signature to each text message, select Change Signature, enter the closing you want to sue, and press save (left soft key)

I have the Same issue and from researching, no we can't add a signiture. Big omission as far as I'm concerned. Always being asked, who is this? Add a 3rd party service maybe "they will get it" and add this to an update, or I created a signature in quick text but it really is a pain to do it this way. But so far this my only complaint on this phone well every pic text is a slide, don't get that either.

go to your message settings and will be able to add signature

This is a pretty easy thing to correct or add to your handset. Adding a signature to your messages You can add a signature to email messages that you send.In the Inbox, press MENU and then tap Settings > Signature.Enter your signature in the text box, and then tap OK.

handcent sms is the app you install from the market. it will allow you to inout a signature, and you can set your own ringtone for texts instead of the droid default tones

From your Inbox, press the "Menu" button. Select "More" then "Settings" Select "General settings" Select "Signature" Edit your signature, then select "Save"

i don't think there is a way using the messaging app that comes with the phone, but there is a 3rd party app that will allow you to set a signature: handcent sms

one other nice thing, it's free! find it through the android market.

sorry not on the v3