After we have created both files, we should now be able to place our new entity within Sandbox:
Open Sandbox and create a new level (or load your level of choice).
In the RollupBar tab, select the first tab and choose Entity in the Objects list. If you scroll in the Browser window to Others and open this subfolder, you should find your new Teleporter entity.
You can drag-and-drop the Teleporter into your level, as seen in the following screenshot. Once you do this, you can select the entity and just modify the properties in the RollupBar tab.
Note
You can add your entity multiple times and change the properties individually for each Teleporter that is placed in your level. The entity that we defined is some sort of template class (a definition about an entity). You can simply drag-and-drop the Teleporter entity from the RollupBar tab into the level of this entity for which we are creating instances.
If you select your Teleporter, you will find...