Once you have your contacts uploaded on your Networking page here:
You will be able to refer any one of your contacts to the open roles at the company you currently work at, provided there are open roles, and that they are listed on Ladders.
Simply click the Refer button under their name, or if you have someone more qualified in mind, you can click "Refer someone you know for this role" or "Have another person in mind?"
You can then fill out the information in the pop-up, or copy and share the link provided with the person.
Referral bonuses are paid by your company, provided they offer this benefit. Many companies offer referral bonuses for their employees, but rarely advertise it.