As of my last knowledge update in September 2021, Retro Bowl is a popular American football simulation game available on mobile devices. While the game allows you to manage and coach a football team, it doesn’t provide an official feature to change team colors. The game’s design typically includes predefined team colors and logos that are not customizable.
If there has been an update to Retro Bowl that introduced the feature to change team colors or if there are unofficial mods or hacks available for this purpose, I recommend checking the in-game settings or the game’s official website or community forums for the most up-to-date information on customization options.
Keep in mind that using unofficial mods or hacks may violate the game’s terms of service or result in unintended consequences, so proceed with caution and ensure you are following the game’s rules and guidelines.