If you are a G Suite user, you'll want to connect your KiSSFLOW account to to G Suite account. This will let you take advantage of features like User Sync and Single Sign-On.
To do this, you need to be an admin for your G Suite account. Start by navigating to the Apps section, and clicking on the Marketplace apps card.
Search for KiSSFLOW in the dialog box and install it from the G Suite Marketplace.
KiSSFLOW will ask for a few permissions to access your account. You will also be asked a few questions to help customize your account.