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First you will need to install the fitbit app.
Log into the Apple App Store with your AppleID and P/W to get the free App - search for “fitbit” it the App Store search box in the upper right corner.
When the App is installed, open it and tap “Join Fitbit” to get started. You’ll be guided through the process of creating a Fitbit account and connecting (“pairing”) your Blaze to your iPhone. Pairing makes sure the tracker and mobile can communicate with one another (sync their data). Write down the username and P/W you just created in case you want to log in from a different device.
Also note the personal information you’re asked during setup is used to calculate your basal metabolic rate (BMR), which helps determine your estimated calorie expenditure. The information is private unless you go into your Privacy settings on your fitbit dashboard (gray’d gear in upper right) and opt to share age, height, or weight with Fitbit friends. The more accurate the details, the more accurate your fitbit experience.
Once you've set up and started using Blaze, you'll need to make sure it regularly transfers (syncs) its data to Fitbit so you can track your progress, see your exercise history, earn badges, analyze your sleep logs, and more on your Fitbit dashboard. A daily sync is recommended but not required; your tracker can store data for up to seven days between syncs.
Everything should be ready-to-go now; but if for some reason you aren’t (or lose the ability) to see incoming notifications, try this:
Make sure that the iPhone Bluetooth is on (Settings > Notifications).
On your Blaze clock screen, swipe up and make sure notifications are turned on. You can also access the notifications setting by holding down the Action (upper right) button from any other screen.
With your tracker nearby, on the Fitbit app dashboard, tap the Account icon (gray’d index card icon)
Tap the Blaze icon.
Tap Notifications and turn on or off any combination of text, call, or calendar notifications.
Follow any onscreen instructions to re-connect (bond) your iPhone with your tracker. After notifications are enabled, “Blaze” appears in the list of Bluetooth devices paired to your mobile device confirming all is well and you are ready to get out there on the road again.
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It's great to welcome you @Bredance and @wmchapman thanks for stopping by.
I just would like to know if the instructions provided by our friend worked? Are you still having issues pairing your Blaze or it is already working?
Hope to hear from you soon. 
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