Whenever I try to change colour , I click on the thing to change colour but nothing really happens .... help D:

yep, global bug.
Idk when will it be fixed.
You have to type the name itself when making threads or being in advanced mode while making a post.

You can use this for preset colors, or you can use this to use any color.

#A84343
#2FB86F
etc

Or just don't go advanced

Or just use the color codes.

thanks tonakai , that helped