How or where to change right and left margins?

How or where to change right and left margins?

I think editing this will fix my images which were okay – but then I went into some areas to edit and wasn’t 100% sure what those areas did. Made a change and broke it.

Even though I used the revert to revision (10 choices) – it did not change anything. I went back 24 hours when I loved the site – but it did not fix the problem.

Any help would be appreciated.

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

 

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