When employee is posting paid job offer and use the cash option the system is showing him the button MAKE PAYMENT.
Payment setting is the place where you can modify Payment Currency, Payment Test Mode, Payment Gateways, etc and even you can create the payment plans to monetize users through here.
Please go to Settings → Payment and modify like what you would like to be.
To create the payment plan, roll down there and feel free to give the detailed criteria and short description for the usage packages. Please take a look at this screenshot:
After completing one package plan, remember to hit “Save plan” and continue with another one.
Please prefer to this link for more reference.
Hope this could clarify your uncertainty.