how to you become skeletron on the forums?

[chocolatecake5000]

Yeah.

 

[Winter-Hooves]

This is in the wrong section, and to answer your question you must get 100 likes total, and then you're awarded the trophy which unlocks the title option.

 

[Charmander27]

http://forums.terraria.org/index.php?threads/titles-trophies-help-support.1618/
Please post all questions about trophies and titles in the link above.
Also, here is a list of all the current trophies and how to get them:
http://forums.terraria.org/index.php?help/trophies

Thread locked and moved.