How can I change the ringtone for the text message on my Samsung Impression phone?

I cant change the ringtone for the text messages but the calls I can. Also want to no how to change the wallpaper when the phone is locked.How can I change the ringtone for the text message on my Samsung Impression phone?
1. Settings

2. Sound Profile

3. Tap on word Normal

4. Top right corner - tap and scroll down to Message

5. Message Alert Type should be Melody

6. Message Alert Tone - choose Melody 1, 2, 3, 4, or Tones on bottom right corner, choose new tone, Add, Save.How can I change the ringtone for the text message on my Samsung Impression phone?
Settings, Ringer Type, Messages

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