# Pre-Usages

Before yuyu calculates your openstack usage, there are a few things to do.

1. Complete price configuration items. If the price configuration is not complete then the system will show a warning and billing cannot be activated. For it we can follow this [**guide**](https://opensource.btech.id/yuyu/price/).

2. **Enable billing**. If billing is disabled, yuyu never calculate openstack usage. Billing can be enabled if the price configuration is completed. Can set with Tab Admin -> Billing -> Billing Setting & Click Enable 


![preusages-billing](assets/images/preusages-billing.png)