IMDb uses cookies to identify registered users. A cookie is simply a piece of text that is saved in your browser's configuration to allow our servers to recognize you every time you visit IMDb. In order to access your IMDb account, you will will need to enable cookies on your browser.
If your browser is configured to reject cookies, you can still access and search IMDb but you will not be able to use any of the personalized features reserved to registered users. To make sure cookies are enabled, please check your browser configuration (usually under the Security or Advanced Configuration section).