Format CoursePress Single Discussion Page and Comments

Hi Gurus,

How do I modify the following when viewing a single Discussion topic (see image)
1) Discussion title H1: font-size:35pt, text-transform:capitalize
2) Comment Header: font-size: 18pt, text-transform:capitalize
3) Avatar image: margin-right: 10px, border-radius:50%
4) Comments input box: border-radius: 6px, color: #222, background-color: #fff, border:1px solid #aeaeae

Thanks kindly,