Here it is put into a circuit:
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From this circuit you can see how to connect a 555 to it. This will "clock" the chip.
Now get the pin out of the chip:
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Now get the function(s) of the chip:
74LS190 PRESETTABLE BCD/DECADE UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY UP/DOWN COUNTERS
Now get the data sheet:
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and look at the block diagram to see how the chip works.
You can see the outputs are Q0, Q1, etc.
These are outputs of a flip flop and they divide the incoming frequency by 2, so that if you have a clock from the 555 that takes 12 seconds for a HIGH and 12 seconds for a LOW, the first output Q0 will send out a HIGH for 24 seconds and a LOW for 24 seconds.
Increase the clock frequency and you can output from Q4.