Round the edges of any rectangle. Press the Up Arrow or Down Arrow key while creating the rectangle.
Change the rounding of rounded rectangles. Immediately after you draw a rectangle with the Rounded Rectangle tool, you can specify a radius for the rounded corners by typing a unit of measure and the letter r in the Measurements box. For example, to use a point value, type 10pt r, and then press Enter or Return.
Once you’ve finished it the radius is set and you would need to make a new one to get a different radius.