Automatic Signature attachment

Hi,
is there a way to have the signatures of members be attached to all of their posts automatically? I don't think they all are going to know how to or want to take the time to attach their signatures under their posts? I want them to be able to because they indicate clans with their clan banners. I already know how to, it is under the options when you make a post. Please help.

First enable sigs in the admin panel Users and groups>user options

Then each member needs to go into their profile>preferences and choose
Always attach signature.

Once they do that, they will show for future posts.

I don't think there is a way to set a default signature for members.

Until the member or administrator assign a signature, it won't display.

The signatures will only appear on posts made after the changes took place. Posts made before you enabled signatures will not be affected by the change.