From the admin view, click on any candidate profile, and go to their "Available Jobs" tab and click the gear icon for the available shift jobs settings (although this is done on any single candidate profile, this is a global setting that will apply to all candidates):
In the settings menu that appears, turn on the setting "Candidates can self assign themselves to shift jobs (accept available shift jobs directly)"
Candidate will then see an "Accept Job" button when they view an available job:
There are additional settings in the same dialog you can configure to control who can accept jobs and the user experience when they do:
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