I'm not sure where the instructions are telling you to look for Integrations (could you link the document you're looking at please?).
https://confluence.atlassian.com/display/BitbucketServer/Linking+Bitbucket+Server+with+JIRA should help you set up the integration. Go into the admin screens (the cog in the upper right will take you there if you're an admin) in Bitbucket Server and find Application Links.
As a project manager, I have discovered that different developers want to bring their previous branching method with them when they join the team. Some developers are used to performing individual wo...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs