Regardless of which application you use - for desktop, mobile or web, when you make an attempt to log in, you will be required to enter your email and password. Below those two fields you will see a Forget Password link. Click it and enter the email you use for your pCloud account. pCloud will send you an email containing a link for resetting your password. Note that the reset password option is available for your account password, but not for your Crypto Folder password.