I'm not sure, how do I check if it's a bitmap? I can send the file to you if you like?Is the "symbol" still a bitmap? I can't read the screen info on the screenshot.
If it is a bitmap, you will need to trace it first and make it into a vector. (that is unless you want to send it to Photoshop and change the colors there, but it still needs to be converted) Once you get it traced..expand appearance and you can then change the fill colors.
I right clicked on the symbol and layers I can't find 'Break Link to Symbol'.right click the symbol and select Break link To Symbol then it becomes an independent shape and not an instance of a symbol in the library. Enabling you to edit colour and strokes also edit individual elements of the symbol.