The usage of inscriptions in this game is as follows:

1. Open the game and find the "Inscription" button on the main interface, usually located at the bottom or lower right corner of the screen.

2. Click to enter the inscription interface, and you will see rows of inscription slots. Each slot has one or more equipped inscriptions.

3. Select an inscription you want to use, click on the inscription, and then a "Use" button will appear at the bottom of the interface.

4. Click the "Use" button, and the system will ask you whether to confirm using this inscription. After confirmation, the inscription will be equipped on the hero of your choice.

5. If you want to upgrade your inscription, you can find the "Upgrade" button on the inscription interface. Click on the inscription, and then select the inscription you want to upgrade in the interface that appears.

6. Upgrading requires certain materials and gold coins, so pay attention to resource reserves. After upgrading, the attributes of the inscription will be improved, thus improving the abilities of your hero.