How to create an external recruiter? 

There are two ways to do it. 

From the permissions tab:

1. On your sidebar, click on Settings
2. Scroll down to Permissions
3. Click on the any permission group
4. Go to the External users tab
5. Click on (+) - located in the upper right corner
6. Choose Create external user
7. Finally, add the email, name, and surname of the external recruiter

From the external users section:

1. On your sidebar, go to settings 
2. Search External users section
3. Click on + New external user button
4. Finally, add the email, name, and surname of the external recruiter

How to add an external recruiter as a Hiring manager?

Steps to follow:

1. Once the external recruiter is created, head to the job opening of your choice located in the Jobs section
2. Click the edit button, located on the top right of the page
3. Go to Hiring team → click on add
4. Filter by type of user and choose an external user
5. Select one of your choices and click on Add Hiring manager