When you are on a personal profile in LinkedIn, you can choose to add it as a contact to your ATS.
To do this, select the "Contact" tab in the plugin. Select the company to which you want to link the person (you can also create companies via the plugin: Add & edit company) and click on "Add Contact". You can also match the contact person with an existing contact in your ATS.
After this, you can edit a contact person in your ATS by adjusting the fields and clicking "Save".