This tutorial by user Vivek Gite shows us how to get users set up properly on your FreeBSD operating system. He goes through the adduser and pw command, confirming their existence, setting up or changing password, and allowing sudo privileges. See the link below for the full set of instructions from nixCraft

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I am a new FreeBSD system administrator. How do I add users on FreeBSD Unix operating systems using command line?

FreeBSD is Unix like general-purpose operating systems. FreeBSD provides various tools to add, modify, and remove local user accounts using the CLI. This page shows how to add users on FreeBSD operating systems using useradd and pw commands.

nixCraft – How to add users on FreeBSD using adduser or pw: https://www.cyberciti.biz/faq/how-to-add-users-on-freebsd-using-adduser-or-pw/