If you start adding information in your Material Library you can add a Call-to-Action button under Redirect Link. If you select the Open Window box, your link will open up in a new tab. If you don't select it, your URL will be embedded and open within your virtual scene.

To edit your CTA button, you can select the corresponding tag in your scene and go to Link Settings in the menu on the right.

Don't forget to click Save after you're done!