The wedding ceremony will be held at the Lothian Chambers register office, in the City of Edinburgh Suite. It is located on the corner of George IV Bridge and the Royal Mile, opposite the Missoni Hotel. Its address is: 59-63 George IV Bridge, Edinburgh, EH1 1RN.
You can view its location on a map here. It is indicated by a little blug flag . The map also indicates the location of other useful points (e.g. the reception venue and local parking).
The ceremony will start at 1.30pm. You can enter through a special entrance on West Parliament Square, round the back of the building beside St. Giles' Cathedral. There is a gathering area inside where you can wait just before the ceremony.
Please note that confetti is not permitted either inside or outside the register office.