This is an accepted solution.
We'd be happy to assist on that, would you mind sending an e-mail to our address below so we can solve that for you swiftly?
After exchanging by email, I gave a "collaborator access" to @JHKCreate who programmed the SKUs of all my products within 24 hours. It also helped me to change the font size of my prices. He is very responsive, fast and very professional. I recommend him.