Who would appoint the President and Members

The President and the Judicial Members of the National Bench and the Regional Benches shall be appointed by the Government after consultation with the Chief Justice of India or his nominee.
The Technical Member (Centre) and Technical Member (State) of the National Bench and Regional Benches shall be appointed by the Government on the recommendations of a Selection Committee consisting of such persons and in such manner as may be prescribed. The Judicial Member of the State Bench or Area Benches shall be appointed by the State Government after consultation with the Chief Justice of the High Court of the State or his nominee
The Technical Member (Centre) of the State Bench or Area Benches shall be appointed by the Central Government and Technical Member (State) of the State Bench or Area Benches shall be appointed by the State Government in such manner as may be prescribed.

(ICAI FAQ PUBLICATIONS 06-09-2017 Qualification, appointment & condition of service of the President and the members of the Tribunal: FAQ NO. 34)