The reference check is digital and can be done via computer, tablet or smartphone, at a time that suits you. Do you need to pause? No problem, the answers you have submitted will be saved and and you can open your invitation again to resume where you left off at a later time.
Are you having trouble opening the link in your invitation? Right-click on the button in your invite (if you're on a computer) or hold it in for a bit (if you're on a smartphone/tablet), copy the link address, and then paste it in your browser.