What is cookies?
Cookies are a mechanism for storing data in the remote browser and thus tracking or identifying return users.

How to enable cookies?
Internet Explorer 5:
From Tools Menu >>> Internet Options.
Choose Security tab, click Internet icon, click Custom Level..., use the vertical scrollbar to reach Cookies and then choose enable.

Netscape Communicator 4.75 :

From Edit Menu >>> Preferences.
Choose Advanced and then click Accept All Cookies(recommended).