shanr5,
We don’t define server runtimes in MyEclipse. You can add them as user libraries.
The following are the steps :
1. Right click on you project and from the context menu go to Build Path > Add Library
2. From the window that opens select User Library and click Next
3. click “User Libraries”. This opens a new wizard. You can create a new library by clicking on “New”
4. After the library is created, you can add jars to that