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If it's yellow, then the wii remote is done charging. But if you put the wii remote on the charger and it immediately turns yellow even though your remote has no batteries, then your charger has problems/it's broken.
It means it is charging.
If it is a USB port charger - plug it into the back of your Wii (which should have a USB slot) or plug it into any other USB port such as a laptop & games console!
The light on the dual charger will turn green. When it is charging the light is red.
If your Wii remote is synced with your Wii, all you have to do is press any button on it.If your Wii remote is not synced with your Wii, select Wii Remote Settings > Reconnect and then press the 1 and 2 buttons to connect your Wii remote.