This will vary, depending on what type of computer, browser and browser version you are using. A good place to start for help with turning cookies on is the online Help within your browser. "Help" is usually one of the choices along the top menu bar. Look/search for information on enabling or disabling cookies. You may also find information on cookies under help topics involving security.
MICROSOFT INTERNET EXPLORER
Select "Internet Options" from the Tools menu.
Click on the "Privacy" tab.
In the "Settings" area, click on the "Advanced..." button.
Put a check in the box marked "Override automatic cookie handling."
Click "OK."
Click "OK" again.
After you reload the page you are on, your cookies should be enabled.
CHROME
Select "Options from the menu."
Select "Under the Hood" from the options menu.
In the "Privacy" section, click "Content settings..."
In the "Cookies" section, select "Allow local data to be set."
Close the "Options" tab.