1. Turn on the computer, press and hold the shift key on the keyboard, and then press and hold the+key.

2. Switch to Chinese input state by using Sogou Pinyin input method. Then enter the pinyin: jia, and click the number key 5 on the keyboard.

3. Similarly, open the sogou input method and click the special symbol to input sogou.

4. In the special symbol of sogou, click Math/Unit in the left menu bar.

5. Find the plus sign in the Math/Units option and click it.