Please can I deepen the blue colour of my forum after purchase??

You may change the style to any colour you wish.

There are a number of style properties including a “Color palette” section which would allow you to modify the several blue colours how you wish and have them take effect throughout the software.
 
Alright my boss.. Is there not any onetime changes that can affect every blue colour in the forum??
Yes, that's what he's saying. The color palette contains the core color scheme for your forum so once you change the palette to your liking, all the places using those colors change.
 
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