1.first, get it translated in arabic (qualified translator) they will put it on their letterhead and sign and stamp by their office as authorized translator.
2.second, take it to ministry of justice( they have the list of authorized translator) that certified it true and stamp it.
3.third, go to your embassy and authenticate it.
4.fourth, go to ministry of foreign affairs.
Please note that,some certificate needs to be certified/autheticated from their country before going through these process. check with your embassy first.