Changing headlight bulb
 

I have nonxenon facelift e46 320i.I have a problem changing my headlight bulbs,it was very easy to remove them, but I just can't put them back, last time I did it, bulb holder fall off and bulb burned lens a little, so you can imagine how pissed I am.I just cant screw bulb holder back, it just does not go in final position, and I dont have manual, so can you please help me with this, I am so embaraced to go in service to seek for help.