Tencent Cloud allows you to purchase the CLB instance on the official purchase page or via API. The two methods are detailed below:

Purchasing an instance via the official purchase page

You can purchase a CLB instance on Tencent Cloud official website. Private network CLB is free of charge, while public network CLB charges instance fees on an hourly pay-as-you-go basis. You can purchase public network on CVM. For more information on the network billing modes, please see Public Network Billing Mode.

The steps of purchasing a CLB instance via the official website are as follows:

1. Log into Tencent Cloud's official website and go to CLB purchase page.
2. Select "CLB" (recommended) as the instance type.
3. Select attributes as needed, such as network and project to which the instance belongs. For more information on attributes, please see Product Attribute Selection.
4. After confirming purchase, make the payment using account balance or credit card.
5. After the payment completes, CLB will be activated. You can configure and use the CLB instance.
   

Purchasing an instance via API

If you want to purchase CLB via API, you can create a CLB instance as instructed in CLB API - Purchasing CLB Instance.