On the workspace or in the picture
list, select the objects or grouped
objects you want to modify.
On the Effects menu, click Distort.
At the top of the workpane, click Distort by painting.
Under Distortion, select Bulge.
Under Brush, select a brush from the gallery.
Drag the pointer over the area you want to modify.
To
correct a mistake, click Restore on the Distort By Painting toolbar, and
then paint over the mistake. To remove your most recent stroke, click Undo Last. To
start over, click Restore.