How to delete samsung cloud without password?
There is an easy way to check Reactivation lock status: Settings> Security, Reactivation lock should be under Find My Mobile category. However, yes, you need Samsung pasword in order to disable it.
Turn off your phone, then press and hold Power + Home + Volum down at the same time until a screen with yellow mark appears, then press Volume up key. Now you should enter Download/Odin mode where you should be able to a line of text REACTIVATION LOCK: OFF/ON.
Actually, you can factory reset your phone in Recovery mode (Power + Home + Volum up) without Samsung passord. However, you may still need to log in Samsung account or Google account while setting up due to Factory reset protection. It would be best if you could get back your Samsung password.