I work over 6 years as Web Developer. I worked with many clients around the world, and from 2012 I specialized in Wordpress.I set up many websites using Wordpress. you're right place for customize your purchased theme or current theme. Clients of Wordpress websites always asked a lot of customization for purchased templates, so I did much work to adjust sites for their requirements doing PHP programming for e-mail subscriptions, pop-ups alerts,standard registration forms and complicated pop-up menus, etc.