It's a red, yellow, green, and blue circular icon. You'll see this icon in the top-right corner of the Chrome browser. It's near the bottom of the drop-down menu. This link is at the bottom of the page. It's the last option under the "Privacy & security" heading. You can uncheck every other box on this page if you like, but the "Cookies and other site and plugin data" box must be checked. In the box near the top of the window, you'll see a box with a time span (e.g., "the past hour") listed. If this box doesn't display the "the beginning of time" option, click the box and then select it. It's in the bottom-right corner of the window. Doing so will remove all of your browser's cookies.

Summary:
Open Google Chrome. Click . Click Settings. Scroll down and click Advanced. Click Clear browsing data. Make sure the "Cookies and other site and plugin data" box is checked. Make sure the beginning of time is selected. Click CLEAR BROWSING DATA.