Hello, I'm new and I'm having trouble getting started. Can I replace my jetpack subscription with convertkit? Right now I manually placed codes in all my posts. Do I need to go back in and replace them all by convert kit? How do I make sure my subscribers don't receive two emails, one from convertkit one from jetpack? Also can convert kit send out broadcast email whenever I have a new post? Can I give subscriber options how frequency they receive emails? Is there a way to hide "powered by convertkit logo"?