how can i recover my password?

For the passcode, see the Apple Support article(s) below. 

Passcode - If you forgot the passcode for your iPad or your device is disabled.     

If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.

Apple ID - Manage  -     

Apple ID – Forgot Password  *      

Which password? Apple ID? To unlock a device to the home screen?