My board can't upload sketch...
why??? Plz, reply...
Maybe, you could post some error and board type first.
My experience is that the my Uno does not load if the "port" is not defined correctly.
On the IDE display, select tools and check the "port" with your device plugged in. I have 2 different Arduino boards (Uno and Primo) and they work on different ports (COM3 and COM4). Not sure that they would be same COMs on your PC. Check the instructions in the Arduino Projects book if you have one.
However, there are numerous other reasons which could make a board not load. If you think the ports are correct and it still doesn't work, you'll need to provide info like board type, IDE version, computer and OS version.