Here, I'll help you.
When you go to the events menu for the door, make sure you are scrolled up.
Then you go to the top event, event 0, look to the right where you see "Unrestricted".
Click that, and a drop down box will appear. Change it to what you want.
If you chose, erm, the one with the BLID, not the restrict but the other one I can't remember. Put your BLID in the box and it will only allow you, or whoever's BLID you put in.
If you chose one of the trust levels, it will only open for the person that has the amount of trust you selected.
(Trustlevel1 = Build, Trustlevel2 = Full, and Trustlevel3 is an easier way than BLID, it will only allow you.)
Click send and you are done.