Don't worry. In the home screen of the Latch app, tap on the link: Forgot your password? You will have to enter the email you used to create the Latch account.
On the Latch application Settings menu you can set the frequency with which Latch requests your credentials.
That a session has been started on another device with the same credentials you currently have with Latch. If you are the only person who knows your credentials, we recommend changing your access password for your Latch account. This will close the application on all the devices on which it's installed.