App instalation
At first, the Booking for Jira application should be added to your Jira and enabled. Read how to find, add and manage the Data Center apps (Atlassian documentation).
After installation, the Booking for Jira section will appear in the Administration → Manage Apps menu, Teamlead section.

Additionally, the app will create three custom fields:
Booking Start: A date-time field required to specify the beginning of a booking.
Booking End: A date-time field required to specify the end of a booking.
Booking calendar: A specialized field that serves as a button on your request form, allowing users to open the booking calendar.