WordPress - Link CTA to Popup form

Budget - 5$-10$. It's a quick task. I already have a clear call-to-action button in place on my WordPress site; and a popup form which opens when we visit the website. I need to get this form open also... (Budget: $10 - $30 AUD, Jobs: CSS, HTML, jQuery, PHP, User Interface / IA, Web Design, Web Development, Website Design, Website Optimization, WordPress)