Add Colored Text Box to PDF

The existing file is a PDF and only needs a single, precise edit: insert a PMS560U-filled text box on the right side of the page and place the short line of copy I will provide inside it. Nothing else... (Budget: $10 - $30 AUD, Jobs: Adobe Acrobat, Adobe Creative Cloud, Adobe Illustrator, Adobe InDesign, Graphic Design, PDF, Print Design, Typography)