Who can send documents under a shared label?

Documents with a given shared label can only be sent by the user who has the "Sender" role for that label. You can learn how to grant permissions for a given label here.

If you have this type of authorisation, you will see an additional "Document labels" field when adding a document. Use them to forward the document to selected people within a specific shared label. All you have to do is select the appropriate label or labels from the field marked below, from the drop-down list.