Menu on header, how can I change the color of the text to white without any highlight?
Can you explain further what you want regarding the "without any highlight" bit?
2. Footer, all content is in grey color and can not be read, how can I change he color to white?
White text will have poorer contrast than the current black colour. Anyway to change it to white add to either your Custom CSS Manager or Child Theme style.css file:
.site-info,
.site-footer a {
color: white;
}when I click homepage button it takes me to my old wordpress.com page, which I do not want.
Set up a custom menu in the dashboard under Appearance > Menus http://codex.wordpress.org/Appearance_Menus_Screen - Then choose the menu items and/or links you want.