Hi André,
You can hide it, please open the language file language/en-GB/en-GB.com_community.ini, find this code :
COM_COMMUNITY_EMAIL_REGISTRATION="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\nPassword: %s"
COM_COMMUNITY_EMAIL_REGISTRATION_REQUIRES_ACTIVATION="Hello %s,\n\nThank you for registering at %s. Your account is created and must be activated before you can log in.\nTo activate the account, click on the following link or copy-&-paste it in your browser:\n\t<a href=_QQQ_%3$s_QQQ_>%3$s</a>\n\nAfter activation you may login to %s using the following username and password:\n\nUsername: %s\nPassword: %s"
COM_COMMUNITY_EMAIL_REGISTRATION_ACCOUNT_DETAILS="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\nPassword: %s\n\nOnce you have completed the rest of registration process, you will receive another confirmation email."
COM_COMMUNITY_EMAIL_REGISTRATION_ACCOUNT_DETAILS_REQUIRES_ACTIVATION="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\nPassword: %s\n\nOnce you have completed the rest of registration process, you will receive another email with an activation link."
COM_COMMUNITY_EMAIL_REGISTRATION_COMPLETED="Hello %s,\n\nThank you for registering at %s.\n\nYou may now log in to %s using your username and password."
and delete this string
cheers
remove the bold text
COM_COMMUNITY_EMAIL_REGISTRATION="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\n
Password: %s"
COM_COMMUNITY_EMAIL_REGISTRATION_REQUIRES_ACTIVATION="Hello %s,\n\nThank you for registering at %s. Your account is created and must be activated before you can log in.\nTo activate the account, click on the following link or copy-&-paste it in your browser:\n\t<a href=_QQQ_%3$s_QQQ_>%3$s</a>\n\nAfter activation you may login to %s using the following username and password:\n\nUsername: %s\n
Password: %s"
COM_COMMUNITY_EMAIL_REGISTRATION_ACCOUNT_DETAILS="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\n
Password: %s\n\nOnce you have completed the rest of registration process, you will receive another confirmation email."
COM_COMMUNITY_EMAIL_REGISTRATION_ACCOUNT_DETAILS_REQUIRES_ACTIVATION="Hello %s,\n\nThank you for registering at %s. Your account details are as follows:\n\nUsername: %s\n
Password: %s\n\nOnce you have completed the rest of registration process, you will receive another email with an activation link."