Good directions and photos. Exactly matched my remote fob which goes to a 2016 Civic.
For others who have different key fobs, these directions and battery types would likely not apply.
Also, for those who are still having trouble:
1) double check the battery is installed with the right + / - position being up or down. It is possible the new battery is dead. I always recommend buying 2 at a time since the cost is so low for replacements.
2) make sure when you take the existing dead battery out that you put it far away from you so you don’t mix it up with your new battery. I have done that one before which is a silly avoidable mistake.