How to set text notifications on the Samsung Galaxy Gio?

I have a "Wu Ha Ha " voice that tells me when a text message is received. I  ( someone) managed to take that off my old phone and it is now on the Gio in my files - Sd card - sounds? How can I import this voice message onto text notifications?

To set text notifications, in Idle mode, open the application list and select Settings > Sound > Notification Ringtone.

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