Hello, and welcome!
First step is to make sure your keystroke that follows the CTRL-b sequence does not also use the CTRL key. To detach, you type CTRL-b followed by "d" alone.
Second step is to make sure you're not using an environment where CTRL-b needs to be escaped ... such as starting a tmux session from within another tmux session.
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The tmux configuration files do not exist by default; if you wish to use either a personal or system-wide configuration file, you must create it with your $EDITOR of choice.
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