as the owner of the phone log into the Samsung website and there will be instructions as well as a manual which you can download for all phone features. For the micro cards there is a "slotted" SD card into which you fit the smaller so that it will behave just like the larger SD card when you plug into the PC, download some music onto it. Eject. and simply install the micro into your phone. Either you can play from the micro card or import into your music library and play away.
Please log in to Samsung website and you will find a manual that will give you a features download guide and select the type of music that you want. For the micro card there is a slotted SD card that you fit in the smaller card then plug in to the PC. Download music into it then eject and simply install the micro into your phone.