I have put my chemformula zip file in a texmf file: iCloud Drive ▸ Secretária ▸ texmf ▸ tex ▸ latex, but it still gives me this error. I have also tried using the terminal to put that package but doesn't work as well. Please help!
You have the BasicTeX package (https://tug.org/mactex) installed as can be seen in your screenshot.
It should be fairly simple to install additional packages via the "TeX Live Utility.app". Look for "chemformula" in the Packages tab, then right-click and select install.