Go to https://portal.azure.com  

Navigate to App Services

Create> Web App

In the Basics tab, under Project details, make sure the correct subscription is selected. 

Create new resource group and type a name.

Under Hosting details, select a Region you want to serve your app from, then type a globally unique name for your web app. 

Under Hosting plans, select preferred plan e.g Standard. 

Under WordPress setup, choose your preferred Site Language, then type an Admin Email, Admin Username, and Admin Password.

Select the Review + create tab. After validation runs, select the Create button at the bottom of the page to create the WordPress site.