Can't format SD card

My mom likes playing puzzle games, but she always runs out of space in her internal storage and has to delete games she still wants to keep. So I bought a Samsung 32 gb evo SD card and threw it in the tablet. I want to format the SD card to act as internal storage. Everywhere I look, it says to click on the name of the SD card and then click on the menu icon, the ellipses in the top right, and select settings. However, it won’t let me select the SD card and all that shows up in the menu is usb computer formatting. I’m not sure if it is supposed to have a more specific name, but the tablet only shows it as SD card. It doesn’t do anything else when I try to click on internal storage either, if that makes a difference.