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To run your app, just right click the project and select Run As > Run on Server. The first time you do this it will ask you to pick which server to run on. If you check the checkbox at the bottom it won't ask you this again. By default, it will go to the action EntryAction.do. If project(s) other than the one you've chosen to run are run also, it is because they were added to your server earlier. You can remove them from the server by going to the Servers window, expanding the Oracle server, selecting the project you wish to remove, right clicking and selecting Remove.
You can access your app in your web browser at http://localhost:8888/apps/yourappnamehere/ and it will automatically go to EntryAction. If you have more than one entry point you will need to specify which action to go to. For SAP apps, you do not need to specify sapSystemId as this is configured in your site/ApplicationLocal.properties file (the r3default property). If you want to access your localhost from a different IP address, you will need to know the name. You can get this info by bringing up the Command Prompt and ping localhost. The response will be something like Pinging fss-115-2.mit.edu ... fss-115-2.mit.edu should replace loaclhost in the URL above.
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