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If you have a laptop, the USB ports are probably on the left or right side of the housing. Desktop users may find the USB ports on the back or the front of the desktop tower, though iMacs have the USB ports on the back of the monitor itself. There are two main types of USB ports found on modern computers:   USB 3.0 — A thin, rectangular slot that's about 3/4 of an inch (a little under two centimeters) wide. You should see a chunk of plastic in the upper half of this slot. USB 3.0 slots are found on the majority of Windows computers and on most Mac computers manufactured prior to 2016.  USB-C — A thin, oval slot that's about 1/2 of an inch (a little over a centimeter) wide. These are most commonly found on MacBook and MacBook Pro computers, though some Windows laptops also have USB-C ports. If your computer has both types of port, you're free to use whichever port you like depending on your USB flash drive type. Look at the metal connector end of your flash drive:  If the connector is rectangular and has a piece of plastic taking up part of the connector, you have a USB 3.0 flash drive. If the connector is oval and has no piece of plastic inside of it, you have a USB-C flash drive. If the flash drive that you want to use is a USB 3.0 version but your computer uses USB-C ports, you'll need to buy a USB-C adapter and plug it into the USB-C port on your computer. This is most common on MacBooks and MacBook Pros from 2016 and up, though some Windows computers also have only USB-C ports. If you're using a USB 3.0 flash drive, make sure that the plastic piece in the flash drive's connector is at the bottom of the flash drive so as to slide under the piece of plastic that's at the top of the USB 3.0 port.  USB-C flash drives can be inserted either way. If you're using a USB-C adapter, you'll plug your USB flash drive into a USB 3.9 slot in the adapter instead.
Locate your computer's USB port. Determine your computer's USB port type. Figure out which type of flash drive you have. Buy and attach an adapter if necessary. Plug your flash drive into your computer.