If you've already logged into your app, on the main login screen, you’ll see there is an “I forgot my password” option. You can click on that and follow the instructions for changing your password.
To see the main login screen, you will have to log out. To do so, you can visit this article on how to log out.
If you haven’t logged in to the app yet, please check your emails and your spam folder for our initial email that sends information with your login information.
If you’re still having trouble with accessing your account, please email support@builtwithscience.com.