All of these are in Appearance › Customize › Travelight Pro.
Color presets
Pick Sunset, Forest, Midnight, Lagoon or Sand. A preset replaces the colors under Colors, and every preset keeps button text readable. Choose None to use your own colors again.
WhatsApp chat button
Enter your WhatsApp number with its country code, for example +64 21 000 0000. A round chat button appears in the bottom corner of every page. You can add a starting message and choose the bottom left or right corner. Leave the number empty to hide the button.
Footer credit
Untick Show the theme credit in the footer to hide it, or write your own credit text; links are allowed.