Candidates can be added to a talent pool from the following sources:

Candidate Workbench (Talent Pipeline page): You can manually add candidates to a talent pool from the Talent Pipeline page, which shows all the candidates who have applied to your jobs or have been sourced by you or your team12.

Auto-populate from a saved search: You can create a saved search based on certain criteria and assign it to a talent pool. This will automatically add any candidates who match the criteria to the talent pool13.

Add from a Candidate Search: You can perform a candidate search using keywords, filters, or Boolean operators and add the search results to a talent pool14.

You cannot add candidates to a talent pool from an email campaign or allow candidates to add themselves. Email campaigns are used to communicate with candidates who are already in a talent pool1 . Candidates can only join a talent community, which is a broader group of candidates who have expressed interest in your company, but not a specific job or talent pool1 . References: SAP SuccessFactors Recruiting: Candidate Experience Administration, Unit 5: Candidate Relationship Management, Lesson: Talent Pools, pages 5-3 to 5-9.