How to completely disable 'further instructions sent to email' message after sign up
You can use rules redirect the user to a pre-defined URL upon registration. This should over-ride whatever default behaviors you are seeing now...


Back up your database.
Enable Rules 
Navigate to admin/configuration/workflow/rules
Add new Rule

Event: 'After saving a new user account'
Action: 'Page Redirect' (optionally 'force redirect')