Already 40% of Scots have signed up, the highest proportion in the UK. Public health minister Michael Matheson urged those not on the register to consider making it their new year's resolution.
Ms Harrold, from Portobello, told how the transplant "changed the lives of my family and gave me the chance to have a family of my own".
She said: "If I'd still been on dialysis, I wouldn't have been able to sustain four pregnancies or be fit and well to raise small children. My transplant allowed me to make decisions and choices that everyone else takes for granted, such as working full-time and having kids."
About 600 people in Scotland need a life-saving organ transplant, with Mr Matheson saying: "I don't think there is a better new year's resolution than to become a potential lifesaver by joining the NHS Organ Donor Register. We know the festive season is an important time for people to spend with family and friends, but I'd like people to spare a thought for the Scots who are waiting for an organ, hoping that they get to spend another Christmas with their families and loved ones.
"For them, the most admirable new year's resolution would be for more people to join the NHS Organ Donor Register. Stories like Kirsten's show the incredible impact organ donation can have on not just one person but a whole family."