You should be able to see it on the MY FILES app already in your tablet. As for getting files onto it, you can either manually copy/move them with the same app or you will have to go to each app's settings depending on what you want to do.
For instance, if you want the camera to store pictures on SD card instead of internal memory (I do NOT recommend that... seriously), you must change that setting on the Camera app. If you want Spotify to save offline data to SD card, then you have to go to its settings and change it there. Bear in mind that not all apps support SD cards.