Sorry this took so long...
Create a new document in Photoshop. Add a new layer and using your Shape tool(Rounded Rectangle Tool) create a shape like this... The edges are set at 16 px to create the rounded sides.
Add a new layer and create a rectangle in the same color and overlap the bottom of the shape above.
Next click on the first layer and then shift-click the second shape layer. Both layers should be highlighted blue. Now right-click and select Merge Layers. Now you've got a nice button shape.
Now you need to apply the bubble look by using a Layer Style. Double click on the button layer in your layers window. The layer style box will pop-up. Click on Bevel and Emboss. I adjusted the depth, size and soften until I got the bubble look I preferred.
Now create a text layer and add your text. Double click on the layer in the layers window again and apply the Stroke style. I used 50% opacity and a 1 px stroke. I then used the same Stroke style on the button to give the button a nice finished look.
Voila!! A simple to do button that looks professional.