The tutorial of switching input method for Mac computer

If your Mac computer does not have any settings, we can press "COMMAND + SPACEBAR" as shown in the following image

If you want to change the shortcut keys, we can click the Input Method icon, open the language and text preferences as shown below.

Third, then we click "Language and Text" After we click "Input source Selection" and then click "Keyboard shortcut Settings" as shown in the following figure

Then when you open "keyboard settings" and then we click on "Keyboard and text input" and then we click on "last input source" and then we click on "shortcut keys to set up" as shown in the following image.