Add a new Particle Emitter by right-clicking anywhere in Area 2 and clicking on the only option given (New ParticleSpriteEmitter). You now have a very basic particle.
Now, you obviously want to modify the default set up. To do so, you can click on any of the modules, such as Lifetime or Initial Size. If you need more than the default settings, you can right-click anywhere in the column and you will get a list of additional modules that you can add.
Argentina
Australia
Austria
Belgium
Brazil
Bulgaria
Canada
Chile
Colombia
Cyprus
Czechia
Denmark
Ecuador
Egypt
Estonia
Finland
France
Germany
Great Britain
Greece
Hungary
India
Indonesia
Ireland
Italy
Japan
Latvia
Lithuania
Luxembourg
Malaysia
Malta
Mexico
Netherlands
New Zealand
Norway
Philippines
Poland
Portugal
Romania
Russia
Singapore
Slovakia
Slovenia
South Africa
South Korea
Spain
Sweden
Switzerland
Taiwan
Thailand
Turkey
Ukraine
United States