Help! How do I get sound to my computer? Installed monitor

Hi I recently purchased a dell S2440L and I hooked up via hdmi but my monitor doesn’t have speakers and my speakers that do have sound isn’t coming out. I looked playback and my it shows my monitor playing or receiving sound but my speakers aren’t working. Please help thanks.
OH Nevermind I finally figured it out.
Answer #1
Go to playback and click on speakers and click set default.
Restart pc.