How to access a personal account on only one device?
Could you please be more specific, provide with us information what you are trying to get.
If you are looking for a way to have only one valid login you can setup it in the Users Settings
I need make logging by one account for one device only not more.
Thanks for advice, but I’m new at Backendless developer, can you explain more by example
Sorry @Mohammed_Kelani for little misunderstanding.
Backendless by the default doesn’t allow to login with same credentials for different devices at the same time. So you don’t need the additional setup.
Also if you would like to allow the user to login to multiple devices there is the “Enable Multiple Logins” option for this.