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Before you can format your Android's memory card (usually a microSD card), the card must be inserted into your Android. Use two fingers to swipe down from the top of the screen, then tap the gear-shaped Settings {"smallUrl":"https:\/\/www.wikihow.com\/images\/6\/68\/Android7settings.png","bigUrl":"\/images\/thumb\/6\/68\/Android7settings.png\/30px-Android7settings.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class="mw-parser-output"><p>I edited this screenshot of an Android icon.
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<\/p><\/div>"} icon in the top-right corner of the drop-down menu. It's near the top of the Settings menu. On a Samsung Galaxy, you'll tap Device maintenance instead. Tap your memory card's name to do so. On a Samsung Galaxy, tap Storage at the bottom of the page instead. This is in the top-right corner of the screen. Tapping it prompts a drop-down menu. It's in the drop-down menu. You'll see this near the top of the page. If you just want to erase the memory card, you can tap Format here instead. On a Samsung Galaxy, you must first tap your SD card's name. You'll then tap Format instead of Format as internal. It's in the bottom-right corner of the screen. Doing so will erase and reformat your memory card. On a Samsung Galaxy, tap FORMAT here.

Summary:
Make sure your memory card is in your Android. Open your Android's Settings. Tap Storage. Select your memory card. Tap . Tap Storage settings. Tap Format as internal. Tap ERASE & FORMAT.