Square space website customisation

Good Evening,

I currently have a Squarespace website from a template which is yet to be released as there are a few buttons and things I need changed but I am unsure as to how to get this done and my limited knowledge of the platform has got me this far.

I am looking for a quick turn around and someone I can speak with and direct over the phone if possible. I know exactly what I want done and hope this is possible.