To find candidates who have applied to your job postings in the past, follow these steps:

1. Log in to your LinkedIn Recruiter account and navigate to the "Jobs" tab.

2. Click on the job posting you want to search for candidates in.

3. On the job posting page, click on the "Applicants" tab.

4. Here, you will see a list of all the candidates who have applied to your job posting.

5. You can use the search bar to filter the list of candidates based on specific criteria such as job title, location, or skills.

6. Once you have found the candidates you are interested in, you can reach out to them directly through LinkedIn Recruiter.

7. You can also save the candidates to your "Pipeline" for future reference.