Download the logo by right-clicking (secondary-clicking) the image above and selecting "Save As..." or similar option.
If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
An apostrophe is used for indicating possession or ownership. "The house's roof" means "roof belonging to the house".
Apostrophes are almost never used to form plurals. The plural of "house" is houses, not house's.
Apostrophes are only used to form plurals of letters: "dotting the i's and crossing the t's", "minding your P's and Q's". However, some style manuals recommend italicizing without apostrophes: "dotting the is and crossing the ts", "minding your Ps and Qs".
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