If it went in and didn't give you any kind of error message, it worked. Inserting a SD card doesn't increase your "Internal" phone memory, it just gives you "External" memory.
"Internal" memory is needed for apps and the phones OS. "External" memory can be used for photos, music, videos, contacts, etc.
If you are trying to add more "Internal" memory so you can run more apps, well an SD card may or may not help you there. For that to work you need 2 things. 1. Your phone has to be running, or upgradable to, Android "Marshmallow" and 2. The manufacturer has to have not restricted that ability on the device. Which does happen. If you are running, or can upgrade to, "Marshmallow", then try the following.
How to turn external SD card into internal storage on "Marshmallow".
NOTE: Please be sure you start with a blank SD card. It needs to be blank because when the card is converted to "Internal" storage, it will be formatted (wiped) and encoded (making the cards data only readable by that device).
1. Go to device “Settings”, then select “Storage”.
2. Select your "SD Card", then tap the “three-dot menu“ (top-right), now select “Settings” from in there.
3. Now select “Format as internal”, and then “Erase & Format”.
4. Your SD Card will now be formatted as internal storage.
5. Reboot your phone.
NOTE: If you don't reboot the phone, many things may not work correctly, so make sure you do.