Header text alignment

Hi

Please can you help – I need to align my header text to the right of my image so that it looks tidy and professional. Is there a code i need to insert and how and where would I put it as I know very little about this kind of thing so foolproof instructions will be much appreciated.

Also, I have been told that I would need a hack written to get it to display correctly in old browsers – is this worth doing and how would I go about it?

My site is twenty-twelve theme. https://www.wendyberesfordeft.co.uk

Thanks in advance for your help.