The benefits of ESO Plus membership are:
3000 crowns for use in the in-game Crown Store at the start of membership period (You can use crowns to purchase cosmetic and convenience items such as pets, mounts, and costumes.)
Access to all downloadable content for the duration of membership
The following exclusive character progression bonuses for the duration of membership
10% bonus to experience point gain
10% bonus to crafting research
10% bonus to crafting inspiration gain
10% bonus to gold acquisition
1. Visit http://account.elderscrollsonline.com/
2. Log in to your The Elder Scrolls Account or create one if you haven't got one.
3. Select Redeem Code on the My Account page.
4. Enter your code.