A family of Microsoft relational database management systems designed for ease of use.
If Access is 64-bit, then you have to match the ODBC to match, so you need to use the 64-bit MySQL ODBC drivers and use the 64-bit ODBC Admin app.
So you'll most probably first need to download and install the 64-bit MySQL ODBC drivers on your PC (have you done this yet?) and then create the DSN using the 64-bit ODBC Admin app.