ECMWF data as WRF input
For any of the basic forecast runs (10 day, ensembles, monthly/seasonal forecasts), I do not believe ECMWF data access is general controlled to ECMWF.INT.  Generally most data, including anywhere near enough to use in a WRF forecast, is only available for purchase at extreme fees (generally we're talking 5+ figures per year).  The only option you might have is if you are doing your modeling for strictly research purposes, in which case you may qualify for a research license at reduced or free cost, or be able to access it from servers at the institution you are associated with.

It does appear that reanalysis data and various other specialized products are available free with an account at their website as described here.  I believe reanalysis would only get you initial conditions which I don't believe is sufficient to run a mesoscale model like WRF(?), and that they are also poorer quality/resolution (please correct me if I'm wrong on any of these beliefs!!)  Archived actual ECMWF output is still pay (see the bottom option on the license page).

I worked with ECM for a few years while producing content at StormVistaWxModels and definitely indeed found most things with them to be quite a challenge, limitation, and pity!  At the time it was fairly abstruse to find what you needed or communicate with them, though it appears to have improved some.