Hello sabrinammartin,
Happy new year to you and your family. Yes, we can help you to modify your existing WP site.
Can you please share your existing website URL and the requirements in details?
We have very good experience in website designing and development using WordPress, PHP, CodeIgniter, CakePHP, MySQL, Ajax, HTML5, CSS3, Bootstrap, jQuery, JavaScript etc...
Let's discuss more details...
Regards
Esha