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If you find a thin, rectangular slot into which your memory card will fit on your computer, you can insert the memory card without an adapter. If you do find a memory card slot on your computer, skip the next step. Chances are high that your computer doesn't have a memory card slot, so you'll need to use a USB memory card adapter.  If your Mac doesn't have USB 3.0 ports, you'll need to buy a USB 3.0 to USB-C adapter into which you can plug your SD card adapter as well. Memory card adapters can usually support both standard SD cards and microSD cards, though you may need a separate one for larger, non-SD cards. Plug your memory card's adapter into one of your computer's USB ports. If a window on your computer opens when you do this, you can close it.  If you're using a USB-C adapter, plug it into one of your Mac's USB-C ports first, then plug the memory card adapter into the USB 3.0 port on the other end of the USB-C adapter. If your computer has a memory card slot, make sure that the memory card's label is face-up (gold connector side-down), then push the memory card into your computer angled side first. Click the Spotlight icon, which resembles a magnifying glass, in the top-right corner of the screen. Type disk utility into Spotlight, then double-click Disk Utility in the resulting menu. Click the name of your memory card in the upper-left side of the Disk Utility window to do so. This tab is at the top of the Disk Utility window. A pop-up window will appear. It's in the middle of the window. Doing so prompts a drop-down menu. Click one of the formats in the drop-down box:   MacOS Extended (Journaled) — Formats your memory card for use with macOS only. You'll see other MacOS Extended options here (e.g., MacOS Extended (Journaled, Encrypted)). These options are also usable on a Mac.   MS-DOS (FAT) — Formats your memory card for FAT, which has a 4 GB file size limit but can run on most platforms.  ExFAT — Formats your memory card for use with most platforms. You may see additional options in the "Format" menu as well. It's a blue button at the bottom of the window. This allows your Mac to begin formatting your memory card. The formatting process can take anywhere from a few seconds to several hours depending on the card's size and your computer's speed.
Check to see if your computer has a memory card slot. Plug your memory card into an adapter. Insert your memory card. Open Spotlight . Open Disk Utility. Select your memory card. Click Erase. Click the "Format" drop-down box. Select a format. Click Erase. Click Erase when prompted.