Bots within Slack act just like users.  You invite them to channels with /invite @nextup-jira or just @nextup-jira and then inviting the bot user to the channel. 

Here are the docs from Slack - Invite members to a channel 

Public / Private Channels

The bot will look for ticket numbers in your chats and provide you with quick issue summaries when you mention ticket numbers. You also got a link to the ticket, the status and the ticket title.

Chat Directly with the Bot

Start a chat with the bot just like any other user. When you provide ticket numbers in the private chat the bot responds with more details.

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