Assuming that powering off your computer is not the direction you were thinking, there are several ways to exit vim.    Each of them requires you to hit Escape to enter normal mode for the editor.   After you're in normal mode:
- `:q` will quit if you haven't modified anything
- `:q!` quits and discards any changes you might have made without prompting
- `:wq` is the typical way to exit immediately after writing your changes.   If you don't have write access, then vim will not quit
- `:x` is a synonym for `:wq`, mostly, except that it will only write new file metadata if changes were actually made
- `:wq!` tries to write changes but quits no matter the outcome, discarding changes if any error happens
- `:qa` this quits everything, but I've never used it, personally
- `:cq` quiits and throws an error
- `:help` is a good choice for other options
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