Steps to Blink LED present on Arduino UNO board.
1. Open Arduino UNO software.
2. Go to File> Examples> 01.Basic> Blink (It will open new window)
3. Connect Arduino UNO board with PC
4. Select board if not done to Arduino UNO\
5. Verify the Blink Code, in Output window it will show as below:
6. Upload code to board using Right Arrow key button (after upload pop will comes as done uploading)
7. LED present on Arduino UNO board will start blinking with delay of 1 sec specified in code.