You can create a variable in your teleporter pad blueprint that holds a value of type “target pad”. Set the variable to editable. When the blueprint user selects the teleporter pad, he can select an target pad in the editor.
The teleporter pad can then reference the target pad’s location. (Be sure to check if target pad is set and print an error otherwise)
Edit: I didn’t see this being in the C++ forum. See below for C++ answer 