Create a new layer by going to the Explore -> Layers page and clicking the + button in the bottom right. Alternative you can click the Add a Layer button from the page of a group, and some MapHubs portals will have a Create a Layer shortcut on the landing page.
Choose the Raster Tiles option
Enter the tile URL for the raster tile service, pay special attention to the template portion of the URL which must have the
Next give the layer a name, description, source, and license. Choose the group where you want to save the layer.
Finally zoom the preview map to the location of the raster data and optionally choose an opacity value for the layer if you want it to be transparent