Well u can active signature in site.
Navigation.
1- Profile.
First step
1- Preferences.(menu)
2- Always attach my signature.
3- Yes.
Second step
1- http://imageshack.us/
2- Search.
3- Host it.
4- copy url in Hotlink for forums (1)
Third step
1- signature.(menu)
2- Edit signature
3- Save.
Finish.