The Blossom Controller is designed to sense which of its zones have actual valves connected to them.
If during setup of the Blossom Appr does not show any detected zones, it could be a problem with your wiring.
After checking these things you can have the Blossom app rescan for zones by choosing the recycle icon in the upper left of the "Setup Zones" section of the app. If none are still detected, see if you can get close enough to the valves themselves to hear if they click during the test. If so, please contact Blossom Support. If they don't, check your wiring again or contact support for more help.