The easiest and quickest way of testing PlantUML is to use one online solution that embedded it. For example, you can use the online server.
Once you've got the idea, you may install locally PlantUML. (There is a page dedicated on installation here)
You must have Java installed on your machine, and optionally Graphviz software which are used for all diagrams but sequence diagrams and activity beta diagrams.
Then you can then download the jar file plantuml.jar, and save it on your local disk.
An easy way of testing your installation is to launch the GUI by double-clicking on the JAR file.
You can also include PlantUML into your own scripts or documentation tools:
@startuml Alice -> Bob: test @enduml
java -jar plantuml.jar sequenceDiagram.txt
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