Method/step 1 Double-click to open the PDF file you want to view, then open Adobe Reader software 2 in your computer, and then click the "View" main menu at the top of the interface, and the following options will appear. After selecting "Fill in and sign" option 3, the right side of the interface will become the following interface. Select Add Text option 4 where you want to add text, and click it. When the mouse enters text, the cursor will be located where you click. Then you just need to enter the words you want to add, such as the word "difficult". The interface is shown in the figure below. 6 There is an option to set text at the top of the interface, and you can modify the color, size, font, etc. 7 If you don't want the added text, select it, then right-click and select the Delete option 8. Then the previously entered text will disappear. In addition to the methods mentioned above, you can also select comments in the view options-the first icon in the drawing tag option 9 means "add text", which is similar to the operation in word, and this is quite practical!