If you want to add a map to your website, add a section with a map first. Click on the Add Section to Page button in the working area to open the sections list, and find a suitable contact section.
Some templates already have a section with a map.
Click on the added section with a map, and click on the Section Parameters button.
8b uses your current address in map sections by default. You can find the Map field in Section Parameters, and enter the needed address. Click on the Update button after it to apply changes.