From the File menu choose New Project...
This will launch the New Project wizard and you should choose General Project to create a new project where you will store your Bio-PEPA models. Choose Next and give your project a name such as Bio-PEPA-Examples. Choose Finish. You now have a project which you can see in the Navigator view.
Choose File New
Other and then choose General
File. Press Next. Choose the parent folder to be the folder which contains the project which you just created. Choose a file name for your new file which ends in .biopepa (for example, simple.biopepa). Press Finish.
You now should see that the file is opened in the editor and that the Problems view reports a problem with the file because it is an empty file, and does not contain any Bio-PEPA definitions. Let us fix this problem by entering a very small and simple model. This simple model will describe a species which decays away to nothing.