The location of the wireless switch on a Dell computer depends on the model. In some models, it is located on the keyboard, but other models have the wireless switch located in the right edge of the computer.
Some of the models that have the wireless switch located on the keyboard are the Inspiron 5520, Insipiron 3537, Inspiron 3421, Inspiron N4050, Inspiron N5010, Inspiron 5537, Inspiron N5110 and Inspiron 3521. In these models, the wireless capability is turned on or off by holding FN and then pressing F2. Models that have the wireless switch at the right edge of the computer include the Latitude e6410, Latitude e6420, Latitude e6400 and Inspiron 5520.