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What should I do replace the storage from internal storage to SD card

My android phone can not give me the way, how to replace it

When I download a thing, the notification directly appears that your memory storage is full. Actually, I have plugged in my SD card

So, how to manage, what should I do

Image result for replace the storage from internal storage to SD card android
Open the Settings app, tap the “Storage & USB” option, and you'll see any external storage devices appear here. To turn a “portable” SD card into internal storage, select the device here, tap the menu button in the top-right corner of your screen, and select “Settings.”
The exact steps are too long to tell and you can check it yourself：https://docsbay.net/how-to-set-up-a-new-sd-card-in-android-for-extra-storage