Resizing Certification Logos

Could anyone please tell me how you save the certification badges in smaller sizes? It looks like on the page there are different sizes available, however, when I have clicked on each download and saved they are all big. On some pages I can resize but not on LinkedIn. 

I am using Chrome. When I right-click I have the option "Save image" as but not "Save target..." as suggested.

I do not understand the hyperlink information offered as an option at the bottom as I can't find what my certification code number is, nor do I understand about "root image directories".

Thank you in advance.