How can they be separated? C5 X7

[atr]

Hi I'm glad to tell that your advises regarding the battery clip were outstanding. I've sprayed it with silicone and that did the trick. so, I've managed to remove the battery and now I have to remove the battery tray - all of it in order to gain access to the gearbox to replace the two solenoids. to do this, I have to separate the unit attached to the battery tray. it seems to me that Citroen used to employ a person who's task was to find ways to complicate simple things. at least, in my case he did a good job. anyhow, plz advise me how to remove it since it's all plastic and I don't wish to break parts.
Thanx.
Avi