Go to you Shopify Admin Store > Apps > Searchly.
Click on Theme Customization.
Click on Color Families.
Page of Color Families will appear where different colors has been given.
Beside every color there's a Symbol from where you can edit/delete colors.
Additionally, App Supports to create new color family.
After creating new color family, Click on the Save Button.
Click on the Data-sync button after clicking on the save button.