How did Deep Palace Song get Chitose?

The specific operation steps are as follows:

1. Enter the deep palace song, and click the option of summoning handmaid on the left side of the interface. As shown in the figure below.

2. Find the option to use the gift package in the menu list, and click Enter. As shown in the figure below.

3. Gift packages are divided into skill packages and silver packages, and silver packages are collected. As shown in the figure below.

4. Find the warehouse option in the action panel, and then click View Warehouse. As shown in the figure below.

5. Check the Chitose in the inventory and click the Use button to increase the life span by 20 years. As shown in the figure below.