In order to attest a copy of a document, you´ll have to present the original document and its correspondent copy.
Before coming to the Embassy, you will have to request an appointment through the following link with the Legalization Department:
The appointments are from 1.30 pm to 2.15 pm from Monday to Friday, the process will take 1 day, you´ll have to come to collect the document the day after without appointment from 1.30 pm to 2.15 pm with the receipts.
The fees to attest a copy are 13 dhs per document cash or card.
By reciprocity, those fees will be 45 dhs if the document is a British citizen´s document, 39 dhs if the document is a Irish citizen´s document and 184 dhs if the document is an American citizen´s document.
If you can´t came personally to the Embassy to deposit and collect the document, you can request a courier´s service to do it in your behalf (always with an appointment).