...
from flask.ext.register import RegisterManager
...

...
signup = RegisterManager(app)
signup.save_redirect_view('index') # A name of view function where you want redirect.
...

...
REGISTER_ENABLED = True/False
...

...
from app import signup
from flask.ext.register import register_required
...

...
# Option
# If doesn't use this code in `before_request`
# Register link of templates will show all time, but
# clients can't use the view.
@app.before_request
def bef_req():
	...
	g.register_form = signup.is_enabled()
	...
...

...
@app.route('/register')
@register_required
def register():
	pass
...