Basic installation is simple, you may run
$ make install
Or if you would like to specify where things should go, you probably want to use something like this
make INSTALL_ROOT=/usr/ install
In which case the plugins will be installed in /usr/lib/edb and the binaries will be installed in /usr/bin/. Finally, if you are doing a make install, you probably want to specify a default plugin path, this is done during the qmake process, see compiling.