In this tutorial you will learn to round the edges of an object in Adobe Illustrator CS3.
Create a new document. Draw a rectangle using the Rectangle tool.
To round the edges of the rectangle, go to the Main Menu and navigate to Object>Path>Offset
The window of Offset Path will appear. Choose Offset: 5 and Joins: Round.
You will get this result. If you want to add more round edges, change offset to 5 or more.
You can perform this with any shape. For example, a star.