§1. A postulation must be sent within eight useful days by the one presiding to the authority competent to confirm the election, to whom it pertains to grant the dispensation from the impediment, or, if the authority does not have this power, to petition the dispensation from a higher authority. If confirmation is not required, a postulation must be sent to the authority competent to grant the dispensation.
§2. If a postulation has not been sent within the prescribed time, by that fact it is null, and the college or group is deprived of the right of electing or postulating for that occasion unless it is proved that the one presiding had been prevented from sending the postulation by a just impediment or had refrained from sending it at the opportune time by malice or negligence.
§3. The person postulated acquires no right by postulation; the competent authority is not obliged to admit the postulation.
§4. Electors cannot revoke a postulation made to a competent authority unless the authority consents.
Source: Code of Canon Law (Vatican.va)