GSA Search Engine Ranker is a software that allows you to automate website optimization and build a lot backlinks to dominate search engines and be on top with your keyword. Here is how you can configure it for proxy use:

Inside GSA Search Engine Ranker, click Options, and click Configure next to "Use proxies"

Copy proxies from the VIP panel and click Add Proxies > Import from Clipboard (our proxies are just in host: port format, compatible with either format listed)

Click Test Proxies > Against Anonymous Test URL first to ensure proxies are authorized and working.

Then try testing against the other options next. 

Troubleshooting
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If all or some proxies fail the GSA Anonymous URL Test, first please ensure your IP is authorized and test a single proxy manually in a browser.
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If proxies pass for the GSA Anonymous URL Test but they fail for another test (e.g., the Google test), please export the proxies which fail and send a message to support requesting those proxies be replaced with "Google Proxies for GSA".