Select the text you want to make subscript
Press Ctrl+= on Windows
Press Command+= on Mac
Click the Home tab
Click the Subscript button in the Font group
Open the Font dialog box
Check Subscript
Click OK
Select the text you want to make subscript
Press Ctrl+= on Windows
Press Command+= on Mac
Click the Home tab
Click the Subscript button in the Font group
Open the Font dialog box
Check Subscript
Click OK