Alignment issues with header and sidebar

Here’s my very new blog. I’m currently using the Kirby template and i’m wanting to make the following changes but am not sure how to go about it. Any suggestions would be most welcome!

I would like to centre the header and also move it right to the top of the page.

I would also like to move the sidebar further over to the right side.

Where would I make these changes and what coding can I use?