Location of Emergency Door
Generally you should look at the emergency exits soon after you board a bus, whether or not there is an emergency. It can help you to quickly locate emergency exits in case of an emergency. Normally, an emergency is located in the right side at back of the bus. Sometimes an door is given in the left side, but in very rare cases. Also, you can use regular doors as emergency exits by forcibly opening them.
Pull the Lever
Once you have located the emergency exit, pull the lever or handle on the top side and it opens the door outside. Make sure the bus has stopped before opening the emergency door. If you open it while bus is moving, especially at a higher speed, this can cause severe injuries and the purpose of safe exit is lost.
Observe Other Instructions
If the exit does not consist of just a lever pull and there are some other instructions, follow them. It can be that the door is opened with a simpler push button but that is in glass box, you will need to break the glass and press the button. This is however not commonly used in buses emergency exit.
If somehow you are not able to pull the lever or push the latch, leave it for others. Do not waste time while struggling with the door, it is possible that your lack of power or concentration might have caused some problem, so if you leave the matter for someone else, it can save your life and lives of other passengers.