In your Blizzard Account Management ==>Game Page,you can register it use the key.
Blizzard give you a 26 character game key to supports digital downloads. Head over to the Blizzard store and register the keys then download your CD image!

CD KEY we will send to Buyer's Account's Email or Payment Email.And also you can check cd key info in your account's History Orders View.

Guarantees that cd-keys is 100% authentic and has NEVER BEEN USED. The cd-keys works on ALL REALMS Battle.net. You need the CD's install it or download the game ISO form internet, we don't provide the CD's.

Insert the game CD (We don't provide the CD ROM)

Install the game - when prompted, type the key we provided via email

The game will install

You have full access to the game and all game servers you're the only owner of the key!

All keys are 100% valid and unique - you'll be the only one with the key.

Features:

Expansion for WarCraft III
One new Hero per race, and recruitable neutral Heroes
A host of new units
Player-built shops
New multiplayer options, game types, and clan and tournament support
Product Description
Following in the tradition of previous Blizzard expansion sets, Warcraft III: The Frozen Throne provides gamers with a vast new chapter in the epic Warcraft saga. In the single-player campaign, players revisit the war-torn world of Azeroth. Several months have passed since Archimonde and the Burning Legion were defeated at the battle of Mount Hyjal, yet a new threat has arisen throughout the land...
One new Hero per race, each possessing powerful spells and magical abilities.
A host of new units, each equipped with new abilities and spells, giving players the opportunity to create diverse strategic and tactical forms of combat.
Player-built shops, unique for each race, equipped with items carefully designed to improve and aid the units of every race.
Neutral Heroes, available for recruitment by all players, that can supplement and strengthen a player's army with all new spells and abilities.
Expanded multiplayer options over Battle.net including multiple new game types, clan and tournament support.
Product Description
After Archimonde and the Burning Legion were defeated at the battle of Mount Hyjal, a new threat rises throughout the land and it's up to you to defeat it.