Discuz! Available codes
[img] code is disabled.
It means that your ID permission is not enough.
Discuz can only be used temporarily! Code, that is, signature, can only be text.
But you can change the font and color and so on.
[img] Code disable means that the image cannot be used for signature.
Only when your user group is upgraded and the permissions are enough to become [img] codes are available.
You can sign with a picture.