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Hello @Jawaher, it's a pleasure for me to welcome you to the Fitbit Community, it's great to have you on board. 
If your Alta is not setting up in your phone, I would like to suggest you the following:
- Restart your Alta, then leave it plugged in and charging
- Restart your phone
- Make sure you have a strong Wi-Fi signal
- Make sure there are no other Bluetooth devices around that might interfere with the set up process.
- Open the Fitbit app and tap on the Account symbol at the top right corner of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
I hope this can be helpful, give it a try and keep me posted in case you need anything else. 
Best Answer