1. In the Azure portal, browse to the database db1-copy10543936 that you want to set up for geo-replication.
2. On the SQL database page, select geo-replication, and then select the region to create the secondary database: US West region

3. Select or configure the server and pricing tier for the secondary database.

4. Click Create to add the secondary.
5. The secondary database is created and the seeding process begins.

6. When the seeding process is complete, the secondary database displays its status.

Reference:
https://docs.microsoft.com/en-us/azure/sql-database/sql-database-active-geo-replication-portal