Signatures are disabled in the WSO section. It is the reason why you may not see your signature file on paid sections, like the WSO section. This restriction has been posted to solely give the "advertising spotlight" to the user who paid for the WSO thread.
I'm posting on the discussion but my signature is still not showing
First, you need to subscribe for the Signature. Refer to your User CP link below.
Toggle the Signature, and once payment of $5 has been completed (lifetime fee), you can edit it here.in your profile section.