There's not much to say; DratBar is easy to use, but here are some pointers.
- Drag apps onto DratBar.
- Drag apps left and right on DratBar to rearrange them as you like.
- Drag off any apps you don't want on the bar.
- Use the left and right arrows to scroll through the apps.
- Right-click the icon in the system tray and click 'Settings' to customise.
- Right-click the icon in the system tray and click 'Hide' to hide DratBar, and click 'Show' to show it again.