If you decided to log in via email or phone No, you'd have to create a password.
To reset a password just log out and tap in Forgot the password? form or use the web version or IOS/Android version of Rose Wallet.
Once you click on the link, fill in the email/phone no, click the "receive code" and fill in the code when received from your email box or phone for reset password verification, choose a new password, confirm it and log in again by using the correct credentials.
Password Reset option is available to users registered via email and phone only.