Now okay.
You make your signature bold or in italics just the way your make your post bold or in italics.
To make it bold, type your signature between these two closed brackets.[b][/b
To make it in italics type your signature between these two closed brackets[i][/i
Typing between them means in the space beetween them. Not in the brackets. Now try these first.
You can make it bold and in italics by typing your signature in something like this. [b][i]signature[/i[/b
Remember to close the two brackets with this.]
Then it will work
[b][i]signature[/i[/b