Change my theme color to purple improve layout

I need a WordPress specialist for a quick task. You simply need to change my theme colour to purple. Improve layout, integrate chat system and make it user friendly. Please do not pitch if you have no idea on how. I simply need the site improved as per branding guidelines and layout transformed abit. Please note we aren't doing a new site but simply a retouch for it to look appealing. You must be responsive and ready to carry out the task within a short time.