To charge your Fitbit Blaze, simply push the watch into the Charging connector.
My Fitbit Blaze is not charging?
This can be due to a number of reasons. Firstly, you may find that the watch has not been pushed sufficiently into the charger. There also could be dust or debris around the terminals of the charger that need to be cleaned.
Another common fix is to ensure your Fitbit Blaze is running the newest version of software. This can be updated using the Fitbit App on your phone.