I'm using a seeeduino v2.2... I was getting errors, and I realized that I had the wrong board. I changed it to the ATmega328 (I think that's correct)
Now I'm getting a new error.
avrdude: ser_open(): can't open device "\.\COM3": Access is denied.
Can someone help? I'm using my laptop and COM3 is the only port
What board were you trying before? The standard ATmega328 board (and compatibles like your Seeeduino) require that the FTDI USB driver software be installed, that the arduino Uno doesn't use.
Here is a test.
Unplug your board from the laptop. Then open the arduino IDE and check what comm ports are avalible, any shown are NOT for your arduino board. Now close the IDE, plug in your board and again open the IDE and check the avalible comm ports, the new additional comm port is for your board.