As mentioned above you would need the necessary css skills to produce the layout you want. We can't just give you a quick fix because you are effectively asking how to code an entire section and that requires knowing all about floats and positioning and how to style form fields.
We could help you one step at a time but it depends on your level of ability. You should start as mentioned above by creating the three floated columns that you need of the appropriate width however take note that you also have media queries supplying different styles based on the window width.
You'll need to tell us what you are having problems with exactly because its basically a matter of just getting on and coding it. If you don't have the skills to do this then you will need to learn them if you want to accomplish that change of design.
Ask specific questions if you get stuck or start at the beginning and ask how to do one thing at a time and we'll try our best to help.:)