$3.$ Experience basic GUI customizations: $$ Find out how to change desktop background and theme $($hint: right click on the desktop$).$ Add $$Terminal$$ and $$Text Editor$$ application and another application of your choice to the top panel $($in the Applications Accessories menu; drag icons to the top panel$).$ Take a screenshot showing the changed background$/$theme and the top panel with your shortcuts $($screenshot $1$b$-2).$