How do I change that "proxy settings" on my computer?

When I try to open my Mozilla Firefox internet, it is said that there is something wrong with the proxy server. How do I can change the proxy settings, and what should be so that I can use the Internet properly again? I'm no expert in computers, so please I list step by step instructions. thnx!

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Aion PvP – Sorcerer Solo Rifting – Part 2

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