writing in to a micro sd card without using serial function

PaulS:
I'm not your bro, so don't call me that.

Stop dancing around, and post some code. The SD library that comes with the Arduino IDE does NOT use Serial to send data to the SD card.

sorry , just saw code and confused
is this okay??
myFile.println("testing 1, 2, 3.");
to write in a memory card...