How do I change a read only micro SD card to write
How do I change a read only Micro sd card to write
That depends. Check to see if there is a small physical lock switch on it. Some have physical locks to make them read only.
IF it is formatted as NTFS, macOS has never been able to natively write to an NTFS volume. It will have to be reformatted or you will have to use 3rd party software to enable NTFS writing.