When creating a job posting, one of the first things you'll be asked is how you'd like to receive your applicants. You'll have three options here:
1) Through the Magnet system
2) Through an ATS system (or any link to your website)
3) Through your email
Just select the option that works best for you, and fill out the extra options. For example, if you select email, just check off any attachments you want applicants to submit, enter your email address, and off you go!