On the number row of your keyboard, you'll find the 1, 2, 3 and 4 keys with icons representing the different modes that you'll be able to use and swap between when pressing the corresponding key while holding down the fn key (located on the bottom right of the keyboard). 

1 Key - Bluetooth Profile 1 

2 Key - Bluetooth Profile 2

3 Key - USB-A Wireless Receiver 

4 Key - Wired Mode 

Pairing the keyboard via bluetooth

1. While holding down the fn key, press and hold down either the 1 or 2 key for 5-6 seconds and let go.

2. The corresponding key would rapidly flash, which indicates that the keyboard is in pairing mode.

3. Within your host device's Bluetooth settings, you'll be able to locate the keyboard as ready to pair and could be named either Bluetooth Keyboard or Slim SM1 Keyboard. 

4. Once connected, then you should be good to go! 

Pairing the keyboard via USB-A Wireless Receiver 

1. Connect the included USB-A Receiver to your host device. 

2. While holding down the fn key, press the 3 key and the keyboard should pair with the wireless receiver. 

3. The wireless receiver would also function if it's connected to either a docking station, hub, or adapter as long as those devices are connected to the intended host device. 

Pairing the keyboard via Wired Mode 

1. Connect a USB-C cable between the keyboard and your host device 

2. While holding down the fn key, press the 4 key to put the keyboard into wired mode and the keyboard should be ready to use. 

3. Wired mode can also function if it's connected to either a docking station, hub, or adapter as long as those devices are connected to the intended host device.