Expression button un clickable

Hi guys, I am trying to make my actors spawn randomly after reading some of the examples available here and on the internet.
However, for some weird reason, I am unable to access to expression button as shown in the attached image (The expression symbol is highlighted in blue but yet I am unable to access it). When I tried to manually enter the code e.g. [random(20,100)] for x and y axis, the images will not show up.

Image link :

May I know where seems to be the problem? Thanks.



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