Mohamad,
The remote Websphere connector is not available in MyEclipse 2015 owing to quite a few issues we found with the feature.The team is looking at rewriting the remote connector but I am afraid I cannot give you a timeline at this point.
I recommend you switch to a local installation of Websphere for development until we get the remote support in the MyEclipse stream.
Sorry for inconvenience caused. Let us know if you have any questions.
–Swapna
MyEclipse Support