Link contact or about us Menu to homepage – Buttons colour – Font

Hi! I am using Catch Sketch Pro Theme to create my website and there are few questions that I either don't know how to do or if its possible or if is due to a problem/bug. I have very little knowledge in this field so hopefully you can help me. 1.- I want to redirect CONTACT in menu (primary) to the "contact info" section further down in the homepage (scroll down homepage automatic not link to another page). The same with the about us in menu (primary) which is in "testimonial" section (scroll down homepage automatic not link to another page). 2.- I have changed the colour theme to dark and although it lets me change the buttons colour to Grey, there are some that still appear as purple. For example in the gallery displayed in homepage, option is given but still remains purple when changed. 3.- Is there any way I can add my own font to this website/theme? If so, how? Best regards, Lucia