Question about Gizmos/Doorway

Hello first I want to say thanks for this great game my friends and myself are in love with this alpha

Now the question i have some problems with the Doorway. If i understand it right it works the way that I place one Doorway on the map press t and select the teleport point right ? But I think i'm doing something wrong I can't get it to work I can place it on the map but cant give it a Teleport point. Did i miss something ?

 

(english is just my second language so sorry for some mistakes ^^)

 

Thanks for the help !