Currently there is no way to access Evernote through Conboy. However there might be in the future. There are two things currently under consideration:

Support for the sharing plugins
We could convert the Conboy notes to something which the Evernote webservice understands and send them through the Evernote sharing plugin. This way we could push Conboy notes to Evernote, but not more.
qwerty12 did a quick test and it looks like the Evernote service does not accept HTML but only PDF. HTML would be easy to create, PDF not that easy.

Evernote plugin for Conboy
There is someone interested in writing a plugin for Conboy which directly supports Evernote. This would be two ways (sending and receiving). There is even some code already, but still many technical problems to solve. I won't say more here - I leave it to this person to unveil the concrete plans. But don't expect anything too soon.

If there are more Conboy specific questions, please feel free to post them here where most of the discussion takes place.