Changing Amazon Banners
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Banner 01 and 02 - Product Page

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Open Shopify Theme Editor: (image shown below)
Open 'Product Pages' (image shown below)

Click on product pages section 
Scroll to bottom, find 'CUSTOM HTML' sections, open each and replace the codes for each banner
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Banner 03 - Collection Page

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Open 'Collection pages' same as product page you open above in theme editor
In the sections list in rights side - Find section 'Sidebar' Open it and find 'Custom HTML' 
Open 'Custom HTML (click on it) and you will see old codes, you can replace them with new banner code. You can paste two small banners codes as well one by one in same 'content' box.
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Banner 04 to 09 - Home Page

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Banners on homepage are also can be updated in relevant sections, you can see all the sections in sidebar on the homepage. all these have 'Custom HTML' sub section in almost each, (NOTE: not each custom HTML is for banners) You will have to identify which 'Custom HTML' section is for which banner or may not for banner at all and for some other settings. Before you do any updates its best practice to duplicate theme first.