Just set the current folder of Matlab to the BioSigPlot directory.

You can also add the BioSigPlot directory to the path list in (File>Set Path) 
or doing it automatically by executing the script "Installation"
If you want to use it as EEGLab plugin you have to first install EEGLab
and then copy the BioSigPlot directory into EEGLab "plugins" directory.
Copyright | Made by Samuel Boudet | Administration