Polling the repository for code changes means that Bamboo will check-out the source-code on a regular basis, and examine it for changes. If Bamboo detects a change, it will trigger a build.

1. Click 'Home' to go to the Dashboard.
   
2. Click the 'All Plans' tab.
   
3. Locate the plan in the list and click this icon:
   
4. The 'Configuration' tab will be displayed. Click the 'Source Repository' sub-tab.
5. In the 'Build Strategy' field, select 'Poll the repository for changes' (see screenshot below).
6. In the 'Polling Frequency' field, specify how often (in seconds) Bamboo should check-out the source-code and examine it for changes.
7. 「保存」ボタンをクリックします。