There are 2 ways to install your lovely high chair banner. It will depend on how wild your party/munchkin will be...
1. Glue Dots:
Place glue dots all around the tray and stick the banner along the glue dot line. (this will tack very well, but may not be as sturdy for long term)
2. Tape:
Tie the ribbon around the back of the chair. Use tape on the 'strategic' corners to ensure it stays in place. (this is the stronger option)