Hello there @EmmaSu, nice to have new members in the Fitbit Community! I saw you are expiriencing troubles to pair your tracker with your Samsung A5. Is important to mention this model of mobile phone is not listed as compatible. If a device is not listed on fitbit.com/devices or the Incompatible devices list, this simply means we are not able to confirm its functionality with the Fitbit trackers and some behavior may not work as is expected.
It wouldn't hurt to try the following steps to troubleshoot the issue you are experiencing. If that does not work, I suggest setting up and syncing via a device listed as supported or using a computer. Our team is always working to test and add more Android devices to the supported devices list, so keep an eye open for updates!
See you around!
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