Hi there,
I would hold the remote in front of the dog and click ANY movement towards it. Basically the same way I am currently teaching my dog to hold a little basket.
Usually dogs start off with a sniff - click and repeat a couple of times
then wait for a push with the nose - click this a few times
maybe a lick - click
eventually the dog will open his mouth - jackpot
Then increase for how long the dog has to hold the remote before clicking
Next is to put the remote on the table so the dog can easily get it (let it stick out a bit) and add your verbal cue slowly to get the remote or whatever.
It's going to take a while - I am on my third training session and my dog holds his basket for 3 seconds.
If your dog already know some commands like "take it" it will speed up the process.
But I am just a beginner to clicker training - someone else might have a different idea how to teach this??