You can put your investments on auto-pilot, just like your savings. It's easy to do right from the starship app. You have two ways of getting this done:
Log in to your starship app.
Tap on the Investing Card
Scroll down past the performance chart
Next you have the option to move funds out of your spending account once it hits a certain balance. Let's say after you have $1000 in your spending account you'd like the rest of your contributions to move into Investments after that. Just move the slider to the value of your choice.
Tap next arrow to accept the terms and conditions and that's it.
Log in to your starship app
Tap the "+" sign in the bottom menu bar
Choose "Automatic" and follow the prompts from there
From this same screen you may update or cancel all auto-investing that you might have set up as well.