Download and install Java Development Kit version 1.8 or higher (e.g. http://java.sun.com)
(NOTE: After installing JDK, set JAVA_HOME)
Download Yanel source code either from the git repository or as snapshot.
Change to the directory which contains the source of Yanel and install it as follows:
EitherStart your prefered Browser, enter the URL http://localhost:8080/yanel/ and start using Yanel either as author, integrator or developer.
Also see the README.txt included by the source.
To edit pages served by Yanel one can also use third-party editing tools such as for example Yulup.