Manage My Third-Party Plug-Ins

Go under the File menu and choose Plug-in Manager to bring up the dialog you see above, which is your headquarters for turning on/off plug-ins (including publishing presets to things like Facebook and Flickr), along with a way to add plug-ins (click the Add button below the list on the left). If you want to turn off a plug-in (maybe Lightroom is acting funny and you want to use the process of elimination by turning off plug-ins one by one to see if one of them is causing the problem—hey, it happens), just click on the plug-in you want to turn off (in the list on the left), and then when its options appear on the right, click the Disable button to turn it off.