1. Place the cursor and click Insert and Special Characters
First, find the part of the document where you want to insert subscripted special characters. Place the cursor and find the Insert button in the toolbar. Next, a drop-down menu will appear. Select Special Characters.
2. Enter Subscript and select a Special Character
After selecting Special Characters, a pop-up image will appear on the screen. Use the search box in the upper left corner and enter Subscript. After you find the character that meets your needs, click the icon. The subscript character will be inserted at the cursor position.