this guide helped me
https://www.keychatter.com/2015/07/05/programming-the-kc60/the TADA68 uses the same interface as the KC60
"To switch between layers, set a key to be the Fn key. Then, pick an option from the drop down menu.
The options are:
空操作 – No operation
瞬时开启层 – Instantaneous open layer
开启层 – Open layer
关闭层 – Close Layer
开关层 – Switch layer
瞬时开启、 按键Momentary open , button
修饰键 – Modifier keys
组合键 – Key combination
单击修饰键 – Click modifier keys
开关修饰键 – Switch modifier keys
清除层状态 – Clear layer status
宏 – Macros"