(1) If a solicitor is engaged to act on behalf of an appellant or a respondent to an appeal, the solicitor shall without delay notify the Prothonotary in writing that the solicitor so acts and furnish an address for service.
(2) If a solicitor ceases to act on behalf of an appellant or a respondent or the address for service is changed, the solicitor shall without delay so notify the Prothonotary in writing.