Within the Crew Details tab you will find Rank. The rank details window allows the user to set a series of qualifications tied to a rank. When a crew member is assigned a rank, they must have these qualifications in order to qualify. To add a new qualification, click on Add Qualification requirement. Type in name of certificate and use the drop down list to select the type of certificate. When this is done, click save. The should happen if a new qualification appears for a particular rank.