Teleport

Setup:
Rez the Teleporter on your land (where you want your first location) and up it to 1 meter above the floor.
Click on it to open the menu.
The "Save Dest 1" Button save the first destination coordinate.
The "Dest name 1" Button set the first destination name.
Take the teleporter in your inventory, and go to the second destination, rez it and up it to 1 meter above the floor.
Click on it to open the menu.
The "Save Dest 2" Button save the second destination coordinate.
The "Dest name 2" Button set the second destination name.
Take it in your inventory and Rez the Teleporter (where you want on your land).
Click on it to open the Menu and choose the "Ready" Button.
To use the teleporter:
click on the teleporter
click on one of the 2 links (in the popup) to teleport at the first or at the second destination.
"Ready" Button:
This button lock temporarily the setup menu: the setup menu will be unavailable until the next rez.
Note:
To allow avatars to teleport anywhere in your land: you need to allow the teleport feature in your Land Settings (Options tab and Teleport routing): Anywhere (teleports may arrive at any location on the parcel).
If your land is "Group owned", you can allow the teleport feature for this group only: to disallow the teleport feature in the Land Settings and to allow it for the Group: Group Profile -> "Roles" section -> "Abilities" tab...