To remove one or more Quick Links, head to your Manage Quick Links page by selecting its name in your Quick Links menu, located in the upper-right corner of every control panel page, or by clicking the "Manage Quick Links" link in the Manage section of the Index tab.
On the Manage Quick Links page, you'll see a list of all possible Quick Links. To remove an existing Quick Link to a tool, click the checkbox next to its name to deselect it. (You can also create new Quick Links while you're here by clicking on the checkbox next an unselected tool.) When you're satisfied with your changes, use the control panel tabs, breadcrumb trail, or your Quick Links to visit another page.