Usb tethering option on my phone

Jun 15, 2018
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I used to have an option to usb tether on my phone when i connected by usb to my computer but the option is gone now? How do i get the option back on my phone? It is included in my plan and I have used it before but it just vanished!! PLEASE HELP! THIS IS THE ONLY WAY TO DO MY ONLINE COLLEGE COURSES!!