Arduino Uno Problem

Hello, Good Evening, I am doing lately a lot codes in my arduino and my problem is, i cannot upload programs to arduino even the example program BLINK. Can i get some advice from you sir/maam? Please, i need to finish my 3 projects in school. and below is the picture of my arduino IDE.

Don't post screenshots of text! That is very unhelpful. When you encounter an error you'll see a button on the right side of the orange bar "Copy error messages". Click that button. Paste the error in a message here USING CODE TAGS (</> button on the toolbar). It is almost never appropriate to post screenshots but in some cases it is helpful to post images. You should attach and embed the image following these instructions:
http://forum.arduino.cc/index.php?topic=364156

  • Make sure you have the correct port selected in the Tools > Port menu.
  • If the port of your Arduino doesn't appear on the menu you may be using a charge-only or defective USB cable.
  • If you have the Arduino connected to a USB 3.0 port on your computer try a USB 2.0 port instead.