A single IC 4033 is able to handle only one common cathode display block and therefore the shown circuit is able to show numbers from 0 to 9 in response to the relevant clocks applied at its input.
The IC may be easily reset at any point. For example suppose 6 clocks were applied at the input and the the display now reads 6, it can be reverted to zero simply by pressing the shown push button, if needed.
Pin #1 is the input where the clock or the pulses are applied for counting.
In order to make the counter able to count to two digit or 3 digit or 4 digit etc. just include integrate the relevant number of modules as shown in the diagram and connect their outputs in the following manner:
Connect pin #5 of the first module to the clock input of the next module and connect pin #5 of the second module to clock input of the third module and so on.
Make the reset pins common, so that a single push button can be used for resetting all the modules at once.
Supply terminals will also need to be made into common rails.
A capacitor of 0.1uF should be connected close to the supply rail for decoupling purpose.