You can easily log into DrChrono web version here. You only need to type in your Username and password.
You can log in from the iPad with your Username and Password, a PIN, Touch ID, or Face ID if you have a newer iPad. You must have downloaded the DrChrono EHR app from the App Store first.
If you forget your PIN, you can review it once you have logged in with your Username and Password. This will be under your account settings on the iPad.