The listing, World of Warcraft Guest Pass has ended.
World of Warcraft guest pass.
This pass will allow you to play World of Warcraft until level 20 and some premium features are not available. After that, you have to pay a monthly subscription.
How to activate the code:
make a battle.net account at https://eu.battle.net/account/en/creation/tos.html?ref=
Then you need to download the battle.net client.
When you've downloaded the client, you need to install it and log in in your battle.net account you just made.
Then you will need to redeem your code after logging in into your account. You activate the code at https://eu.battle.net/account/management/claim-code.html
Then you have acces to the World of Warcraft world up to level 20!
If I said something wrong in this little tutorial above, leave it in the comment :-)
And if you have questions about the Guest Pass, Leave it in the comments :-)
Good luck!