How to connect the button Get Started with the form to proceed to payment

I have created products Page Plans-and-Pricing at https://www.evalcommunity.com/organizations/plans-and-pricing. At this page, if the customer click on Get Started, he is directed to the View Cart. How to connect the button Get Started of this page with the Page at https://www.evalcommunity.com/organizations/post-job-or-tender/ where the customer should fill out the form and proceed to payment?