how to make an object move on the menu screen?

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User offline. Last seen 4 years 23 weeks ago. Offline
Joined: 24 Jun 2012

I want to add some animations in the menu screen of my game. I want an object to keep on floating on the menu screen. To be specific, I want bubbles to keep on moving from bottom to top on my menu screen. It just moves (No interaction with the users). How can I implement this?