First, you will need to add this requirement as a qualification. To do this, add a new qualification by going into settings and selecting ‘Qualifications’ from the menu on the left hand-side, then enter the name of the qualification and save. Then, you will need to link this qualification to an ability. To do this, hover over the tab ‘Contacts’, then under ‘Crew’, click on ‘Crew Abilities’. Add a general ability with a description that includes ‘COVID-19 vaccination certificate’ for example. Click on ‘+ Add Ability’ located on the top left-hand corner, and fill out the fields that are displayed on the screen and save. Edit the ability by pressing the edit icon located on the right-hand side. Add a qualification using the drop-down menu under ‘Qualification’, and select the qualification you require your staff to submit. Then, go to settings, locate the ‘Recruitments’ subheading, then click on setting 21 “Enable Abilities for applicant to select upon sign up”. Select the requirements you would like to assign and then using the arrows, move the availability to ‘Assign Abilities’ To ensure that recruits select this ability on the sign-up page, remove the other abilities from this section so that they are required to upload the relevant documentation, and press save. Therefore, an option for ‘General Staff’ will appear on the recruits’ sign-up page, which they can select. As this ability is linked to the qualification ‘COVID-19 vaccination’, they will be required to upload their vaccination certificate, otherwise they will be blocked from assigning shifts.