my apple 5c iphone is locked up

Locked up in what way? Locked up as you entered the passcode incorrectly too many times or the phone simply doesn't turn on?

If it's the former and you really can't remember you passcode then you'll need to follow one of the methods here: If you forgot the passcode for your iPhone, - Apple Support

If it's the latter, try holding the sleep and home buttons until the Apple logo appears.