Unfortunately there is no content in your question... if you wish a response please restate your question. Thanks
To change colors, quick tap on any of the brushes in your toolset. In the menu that opens, quick tap on the Color circle and the color wheel (and other options for changing the color) will open. Once you've chosen one, tap the + icon to save it to your brush. Tap Done to exit the Color menu.
If that's not what you were looking to do, let me know.