Based on the given information, I see that both components, K and A, each have only one pin. To connect them, you would connect the single pin of K to the single pin of A.

However, it's also important to include other relevant components depending upon the application context. For instance, you may need to include a power supply and a current-limiting resistor.

You can follow these steps in Flux to make the connection:

Remember this will only connect the components electrically and does not set up the correct power for the LED. I am assuming that you're using standard values for the LED power supply (i.e., a supply voltage of around 3-3.3V, since the forward voltage of the LED is 2.8V) and a standard value for the current limiting resistor (something in the range of 220 - 1k ohms). Please make sure you choose appropriate values for your particular setup.

I want to connect connect three LEDs in a series

To connect three LEDs (with the designator LED for example) in series, you can follow these steps:

Make sure your voltage supply is capable of providing the sum of the forward voltages of the LEDs (2.8V * 3 in this case) at the required current. Also, ensure you are using a suitable current-limiting resistor if the power supply voltage is higher than required by the series LEDs.