Your apartment will typically have a simple thermostatic control that will allow you to adjust the temperature in your apartment.
This is an example of a generic dial type thermostat used in residential developments for many years.
In this example the temperature is set to 20°C.
There are however many different systems in use, some with advanced features allowing remote access, and you should have received user instructions for these upon occupancy.
You may also have thermostatic radiator valves (TRV) on your radiators which can be adjusted. The higher the number shown on the valve, the higher the temperature and vice versa.