I seem not be able to find the teleport marker I found a door marker and a portal marker. The door marker looks like the yellow marker in the tuturoials but it will not transfer to the render window. If anyone knows this little bit which is everyone. Have fun and get back to me.

Well, i've never had to place them. If you set up two doors as teleport pairs, the yellow markers just appear nearby. Then I just adjust their position a bit so they aren't clipping anything.

Make sure that markers are visible in the Geck (toggle with 'm')

Thanks you for the advice.