The procedure of making Qada of this one day is as follows: If there is time remaining in that Ramadaan, one must perform I’tikaaf with the Niyyah (intention) of Qada in that Ramadaan, commencing from the setting of the sun of one day until the setting of the sun of the following day. If there is no time in that particular Ramadaan or if it is not possible for any reason to perform I’tikaaf therein, then apart from Ramadaan, one can keep a fast on any day and perform I’tikaaf for one day. On the other hand, if one makes Qada the following Ramadaan, this also will be valid. However, there is no guarantee of life and therefore one should make Qada as quickly as possible.