Use a find/change looking for all bold text in the formatting box.
Change it green. You’re probably better off creating a character style for this though and using that for the change.
Look into table and cell styles for the tables.
Ah thanks for pointing me in the right direction.
For anyone else with this issue..
Go to Edit > Find/Change
Find Format Box: Look for bold (or whatever you need changing)
Change Format Box: Choose what you'd like instead - in my case I wanted it to go green.
Search: Document (so it changes all the bold in the whole document)
And thats how it worked for me.
As Bob pointed out, it would be very helpful for you to get into the habit of using paragraph and character styles in your work. In your screenshot, the bottom pane (where you have + color: Word_R141_G198_B63) can be clicked and one of the options available to you is New character style. This lets you create a new style to colour the text green, and the benefit from then on is that if you later decide to change to some other colour or indeed any other style change, you can just change the character style and won't have to go through doing find and replace each time.
Thanks Malcolm, I'll try that now