Bot setup
In your Telegram client find @BotFather bot and create your bot with steps described here and copy your bot token.
Log into your Jira instance as an admin.
Go to Apps dropdown, then select Manage Your Apps.
Find JirBee - Jira and Telegram Integration & Notifications in your plugins list and click on the Cofiguration button.
Paste bot token in Telegram bot token input and press Save.