Step-By-Step:
1. Go to the folder where you installed LoL.
For me it's C:/ Riot Games/ League of Legends
2. After that go to game > DATA > Characters
If "Characters" doesn't exist, create the folder.
3. Download the file in the link.
4. Unzip it.
5. Cut-Paste the Cardmaster folder into the "characters" folder.
TF will now look like V on your screen in all future games. If the enemy side or a team-mate is using TF, he will look like V. Note that it will look like V only on your own computer, others will see the default skin. If you don't want to use the loading-screen that the modder supplied, delete the cardmasterLoadScreen.dds file.
If you want, you can also turn TF's basic-attacks and cards into daggers as the modder has changed the particles. To do this, go back to DATA.
Paste the "Particles" folder that was included in the zip there.
Done. For general instructions, go to
http://heroesmod.com/skins/viewtopic.php?f=50&t=3 and follow the first method.