Create New Contact

Step 1 - Click [Contact] in navigation bar.

Note: if the link not included in navigation bar, click Search button then enter customer into search box then select the link

Step 2 - Click [New] to create new Contact

Step 3 – Enter Contact information.

Enter Name and Address 

Enter other remaining fields if needs.

For more information, please see Create Business Contacts - Business Central | Microsoft Docs

Create Opportunity from Contact Card

User can select Create Opportunity from Contact Card if needs.

Select Process, Create Opportunity...