I have this message come up on a couple of lines of my text code, XCODE project, not sure how to resolve / modify code to rectify, any help appreciated.
You should provide a code snippet in order for people to help you (as otherwise we'll have to guess, meaning we won't be as helpful as we can be). That said, the "use of unresolved identifier" typically means that you're trying to refer to a symbol that hasn't been defined.
For example:
Code:
let redColor = UIColor.red
print("\(blueColor)") // Will generate the error you're having