In your site's text editor, the standard "Paste" button contains the same functionality as the Paste From Word button, and Word content will automatically be detected and cleaned.
The "Paste" button appears in the text editor window, as below. To copy from a word document, select and copy ("Command+C") the text you'd like to paste rom your Word document, and then click the "paste" button in the website's text editor. A pop-up box will appear where you'll insert the text from your Word document with "Command+V". This will clean the special formatting from the word document. A "Paste as Plain Text" button is also available, which will remove all formatting, and allows you to paste from other text editors, websites, and non-standard formats.