Hi Usama,
Here are the steps typically required to activate a user to a store.
1. Select a retail worker associated to the Retail company USRT.
2. Ensure that the selected worker has requisite cashier/ manager permissions to operate POS.
3. Associate that worker to your user ID in the system admin module.
4. In the employees/ worker master, associate your user identity to that worker.
5. Ensure that the worker you've chosen, is a worker linked to the store that you are trying to log into (Store master --> Workers).
6. In the devices master, ensure that you validate the POS device for that worker.