> Thanks guys!  I installed i3.

Nice!

> Would you tell me how to access wifi

If you're using MATE+i3, I would add "nm-applet" to Startup
Applications. If you're using i3 on it's own, I would add
"exec --no-startup-id nm-applet" to ~/.config.i3/config.

That's assuming you want a graphical solution. If you want to use a
terminal, just run

$ nmtui

> and how to shut the computer off in i3?

$ poweroff

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