turn off your computer, plug in the key, press the power button to turn it on, then immediately and repeatedly press your boot menu key, it's probably of the f keys above the numbers on your keyboard, if you have an hp laptop it's going to be f9 otherwise it's often f12 but that can be any other one, try googling it, then you will have a menu appear which lets your select "usb something whatev" select it and press enter, if that doesn work, you'll have to learn all about configuring your bios to run linux
alright that's good, that means it's seeing the key as bootable, you need to enter the bios config, same procedure, but it's another f key, then you will find an option that's called secure boot and you can change it from "enabled" to "disabled", on some bios, you first need to erased the stored secure boot key first
it shouldn't reset your device, secure boot is only there to prevent someone from doing exactly what you're trying to do, booting another os on the computer, that said, if you're going to mess around with a linux installer without full knowledge of what you are doing you should absolutely back up your entire drive first, the easiest method being phisically removing the hard drive and putting another one in
in the bios config menu, you can access it when you start up your computer and spam the appropriate keyboard key, you can find out which key it is by the brand of the computer, or the brand of the motherboard if you assembled the pc yourself, then inside the bios config menu you will find the secure boot option.
for example, on my computer, I need to turn it off completely, then press the power button and quickly press the f2 key repeatidely, then instead of launching my operating system, it launches the bios config menu, and in that menu, under the "boot" section, I find a line called "secure boot" which I can enable and disable, once i've done so, I press f10 to save the configs I made, and boot my system where I want