Set Environment Variable for Ranger File Manager

I've recently stumbled across ranger file manager and immediately took a liking to it. However, there is still a problem I couldn't figure out the solution to: How is it possible to change environment variables for ranger? I want my default editor (e.g. pressing E) to be vim but setting: export EDITOR=vim in .bashrc doesn't seem to help. Any suggestions?

Thanks in advance! R.G.