My website won`t load with www

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Gregor Grigorian: I tried but it says there is the original version already.
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  Steve Wiideman: Start at the DNS level. Either use an A Record of @ and point @ to your IP, or simple create an additional A Record for www and point it at your IP.
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  David Kutcher: You`re not inspiring confidence in webmastering or SEO...
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  Gregor Grigorian: I have to call GoDaddy to clear the cache, I tried clearing it in WP-ADMI
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  Steve Wiideman: The www and non-www seem to appear on my Galaxy Edge+
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  Jim Munro: www should not load because www is 301 redirected to your root directory or at least that is what I see from the desktop. If Steve sees both, then something must be misconfigured. Maybe it`s a plugin. Your DNS is answering for www as a CNAME. I doubt that GoDaddy can help. http://www.longislandwebmaster.com/ 301: Permanent redirect to http://longislandwebmaster.com/ http://longislandwebmaster.com/ 200: HTTP/1.1 200 OK
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  Gregor Grigorian: I fixed it. I cleared the whole cache.
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  Jim Munro: You did not "Fix it". www is still redirected to the root domain but you should investigate further because, when testing, I encountered an error which cleared on the second try. BTW, "clearing your cache" should have no effect on the issue you are describing.
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  Jim Munro: You may have seen a cache error but it is unrelated to your original question viz "Can anyone figure out why my website won`t load with www?" Your website will not load with www because you have configured it to load only as the root domain. This is not a bad thing, it`s best practice to choose only one version of your site, either www or non-www.
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  Gregor Grigorian: So what do you think the error is caused by? It said it was a cache error.