I’m using apple 6s plus I forgot my iCloud password

iCloud uses your Apple ID and password. If you only have one Apple ID, it would be the same ID and password as you used to log into this forum. If you have another and have forgotten the password, see the following: If you forgot your Apple ID password - Apple Support

Good evening, thank you for using Apple Discussions.

If you forgot you Apple ID password, you should be able to reset it using many different ways found on this link: https://support.apple.com/en-us/HT201487.

If you have any further questions regarding this, feel free to reply.