questions about the structure of the theme

Hello, Your theme has options intéressante.Mais I have 3 questions: 1 Question, how is it possible to script advertising exp: Leaderboard: 728 x 90) at the top right of the header logo Question 2, how to reduce the size of excerpts from articles? I know that we can reduce the number of line but the overall size of presentation of new items? Question 3, how to remove the light gray contour that is in the page, around the slider, sidebar sidebar around excerpts from recent articles ... thank you cordially Philippe