Here's a few reasons why a licensed password might not work.
If you're unable to correctly enter or remember your password, you can reset it.
Reset your password here: http://cmsgo.io/license/register
After registering with a new password, you'll recieve a new Go Key.
When Re-Registering using RapidWeaver...
Delete your old Go Key, and add the new Go Key to the RapidWeaver Resources, and publish.
RapidWeaver File Linking
When using Go with RapidWeaver, file linking must be "Relative to Page". You can check this by going Settings > General > Advanced > File Links Are > Relative to Page.
Editing on localhost
The password and domain are used to validate editing to begin. Because localhost isn't matching your license domain, editing is being prevented.