Regarding the link in the footer, you can insert any html there. For example copy the following code and modify it to your liking and insert your text into the Footer Insert textbox in “Appearance > Theme Options > Footer”
Regarding the second query, you have to modify the main.js file in the theme folder. In line number 365 reduce the value of the width to 100 or something.
if (width > 768 && (yPos > 200))