
What is Transmogrification?
Transmogrification is a feature that players allow to alter the appearance of their weapons and armor for a Transmog Token.
Where do I transmog my equipment?

You can find Warpweaver Hashom near the battlemasters.
How do I get a Transmog Token?
Voting: http://www.smolderforge.com/vote and choose "Transmogrification Token".
Donating: http://www.smolderforge.com/donate and choose "Unlimited Transmogrification".
Rules for Transmogrification
- The character must be able to equip both items.
- Only uncommon (green), rare (blue) or epic (purple) items may be transmogrified.
- Only appearance can be changed, stats can not be moved.
- Items must share the same armor type (examples: plate for plate, cloth for cloth).
- Weapons must be the same weapon type.
- Main hand weapons can only be used to transmogrify Main hand weapons.
- Off-hand weapons can only be used to transmogrify Off-hand weapons.
- One handed weapons can be used to transmogrify a Main hand or Off-hand weapon.
- The displayed enchant will be that of the currently equipped item.
Do I get my tokens back by removing transmog from my items?
No. Transmogrifying is a one-way service. You will not receive a refund on your tokens by un-transmogrifying your gear.
Removing transmogrifications will not remove them on gear that is in your bags or bank, only gear that you have currently equipped.
Can I transmog legendary items?
Legendary items cannot be transmogrified.
Can I donate for special items for transmogrification purpose?
http://www.smolderforge.com/donate and choose "Popular Transmog Items" or request one via [email protected].

Source: http://www.wowwiki.com