XenForo 1.2 now has a new collection of permissions to control what your users can put in their signatures.
For performance reasons, these restrictions are only checked when a user tries to change their signature. It will not invalidate existing signatures.
The easiest thing to do is to simply show the permissions that can be set:
For user friendliness, if a user tries to use a BB code tag that they don't have permission to use, it will simply be stripped out. For other errors (too many images, too long, etc), the user will receive an error.
For performance reasons, these restrictions are only checked when a user tries to change their signature. It will not invalidate existing signatures.
The easiest thing to do is to simply show the permissions that can be set:
For user friendliness, if a user tries to use a BB code tag that they don't have permission to use, it will simply be stripped out. For other errors (too many images, too long, etc), the user will receive an error.