All the member countries of UNO are the members of its General Assembly also therefore; it is the biggest institution at the world forum. The annual meeting of the General Assembly is called every year at its head office New York. Every country can send her 5 representatives in this meeting.
Apart from this, an extra ordinary meeting can also be called upon at the request of any member country needs. The matters presented in the General Assembly, may be of two natures; the common matters and the specific matters.
If the matter is of common nature, the Assembly can decide on the basis of simple majority of votes but in case of specific matters, two third majority votes are required.