STEP 1
Open up your Arduino IDE

STEP 2
Connecting the Arduino to the computer USB
STEP 3
Tools--board,choose your Arduino
Tools--Port,choose COM

STEP 4
File--Examples--Basics--Blink

STEP 5
Than you can see this code

You can Turn the LED on(HIGH),turn the LED off(LOW)
And wait for a second(delay(1000)),if you want two second,Change 1000 to 2000.Is that simple?
STEP 6
Click Upload

STEP 7
Check out our Arduino,yellow LED Blinking.Congratulations,you get ready be a maker.