Choose Tools | Options to open the Options window. Within the Menu and Toolbars nodes, you can cut, copy, and paste commands in the various menus and toolbars. You can copy commands from the Actions node, which contains all available commands.
You can grab toolbars in their drag area and rearrange them by dragging. If you right-click an empty space in the toolbar area, a contextual menu will appear allowing you to add or remove toolbars from the current configuration and to create new configurations.