Install the PulseDeck field
On your phone, tap the button below (it opens the Garmin Connect IQ Store) and hit Get it / Install. Garmin Connect Mobile pushes it to your watch automatically — no watch buttons yet.
Get PulseDeck on Connect IQ ↗Add it as a data field
Now on your watch: start any activity (e.g. Run), then hold MENU → Data Screens → Edit → tap any field slot → Connect IQ Fields → PulseDeck. (Exact wording varies a little by watch model — look for "Connect IQ" in the field-picker list.)
Enter your gym code + name
Switch to the Garmin Connect app on your phone → Devices → your watch → scroll down to the installed Connect IQ apps → tap PulseDeck → tap the gear/settings icon. You'll see exactly this — just two fields:
Type the gym code from your invite (or ask the front desk), plus your name so you show up correctly on the board. No password, no separate sign-up.
Start your activity
Start a Run or Cardio activity on your watch — that's the exact moment you start streaming. Check the gym TV and there you are.