Posting how I use ezdrummer in Reaper in case anyone wants to know.
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Here is how I use virtual keyboard in reaper.
open new project...click on track in top menu and add new track.
click on FX button on the actual track itsself and add ezdrummer.
On the track click on the "ar" button and then turn on the monitor button to the right of "ar" button.
Now click on the black bar where it shows numbers and -inf
Choose midi input and then virtual midi keyboard...I choose all channels
Now go back to top menu at top of page and click on view and click on view virtual midi keyboard.
now click on virtual keyboard using mouse...if you can hear sound you can now use computer keyboard.
When recording remember to click on virtual keyboard before using computer keyboard...that way seems to work all the time.
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basically hit record then press mouse on virtual keyboard then you can use computer keyboard after that.