Sure, just right click an empty space and choose "toolbars". Then edit the toolbar that is already selected.
Create a new button by pressing the "*" button, then double click the new button to bring up the properties.
In Categories, choose "macros", then choose "run macro" from the commands box. In the "Macro:" box select the macro you want to run.
You may also want to check out the "Customize..." button under bitmap as this will allow you to change the icon, or draw your own.
Also look at the "bitmap button" tab as you can select your tool tip string and even an accelorator key.
Good hunting...
calculus