Take the appropriate action and verify that the warning light turns off.

Taking Action
Message Indicated on DisplayMazda 6 Owners Manual: Cruise Control (Some models)
With cruise control, you can set and automatically maintain any speed of more
than about 25 km/h (16 mph).
WARNING
Do not use the cruise control under the following conditions: Using
the cruise control under the following conditions is dangerous and could result
in loss of vehicle control.
...
Mazda 6 Owners Manual: Front fog light bulb removal/installation
1. Disconnect the negative battery cable.
2. Remove in the order indicated in the table.
Caution
A halogen bulb generates extremely high heat when it is used. If
the surface of the bulb is soiled, excessive heat will build up and the
lights life will be shortened. When replacing the ...