1. Select your shapes tool. In the tool options, choose the circle: 
Check "Antialias" & "Create as Vector"

2. Draw your circle and adjust it to the size/shape you want 
(if you're working with a circle already on your layout, just do this 
so that it covers up the circle you already have). 
Do NOT convert to a raster layer.

3. Choose your text tool and hold it over the outside of the box that is 
around your circle. Move it around a little until you see an "A" with a 
curve below it.

4. Click while you see the A and the curve and type your text. It will wrap 
around the circle (being sure to create the text as a vector as well).

5. Click "OK"

6. Select your Object Selector tool (the square with an arrow inside of it), 
and click anywhere outside the text and the circle to deselect them.

7. Using the object selector tool, click on the text.

8. Go up to "Objects", "Convert text to curves", "as single shape".

9. Select the circle and hit "delete" to get rid of it. 

10. Now you can convert your text to a raster layer if you'd like.

The text will retain the circular shape and you're finished!!

~This will work for any text on a path, as long as you create the path (shape) as a vector~