Panel

MATE: To add or subtract items from the panel or change it's size/color, right-click the panel and choose "Properties".
You can also drag-n-drop items from the menu into the panel.

Openbox: Choose "Tint 2 Panel Settings" from the menu, which will open a GUI where you can edit settings. Your
current config will be at the top of the list, the others are some default alternative set-ups that came with the package.
To edit, click the icon at the upper left with the "i" on it, or use the drop-down menu at the top which will offer the edit
option as well. When you've made your changes, hit "apply" at the bottom and close.