How to centre a logo

Hi there,

Can anyone help me, please? I have been using Duena Child 01 for 7 years now and I needed to amend my logo but when I uploaded it again, it’s going on the left-hand side instead of the centre. Also, when I click on publish, none of the changes I make come up straight away like they used to do.

Any advice would be really appreciated!

Many thanks

The page I need help with: [log in to see the link]