For instructions on this plugin view the ATbar Wordpress Plugin Guide.
The ATbar sidebar widget can be added in Appearance, Widgets then adding ATbar to your active Widgets.
Create your own toolbar at http://marketplace.atbar.org or use one of the pre-made toolbars.
Copy the install button link in the text box (the full javascript string)
For further instructions view the guide.
Enter a comma-separated list of page IDs or name to exclude, e.g. 1,2,3 etc.