Once you insert a microSD card, you will get a directory external_sd under /sdcard (you can check this use the My flies app included in your Note. So, you can copy/move files to this directory. Sometimes, ES File explorer (https://play.google.com/store/apps/details?id=com.estrongs.android.pop&hl=en )is easier to use.
You can also download files directly to external SD card, instead of the internal storage. In the stock browser (internet app), you cna go to menu–settings–advanced–default storage. You can set it to memory card (instead of device) to use the external microSD card.