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If it was more than 5 days ago when you registered your domain, there is unfortunately no way of changing or cancelling it. This is not Yola-specific, but applies in general for domain registrations, so it's unfortunately beyond our control. The only option is to register another domain, assign your website to this new domain (you can assign multiple domains to one website), and let the old one expire.
I hear what you say about wasting a domain name you no longer need. However, it can be beneficial to keep a domain until it expires because
visitors to your website who have only known your current domain will still be able to find you online until most of them will have learnt about your new internet address
it is beneficial for search engine optimization to have multiple domains associated with your website
you can keep potential competitiors from taking your web name away from you by registering your domain under their name.
From this point of view the money you spent will still be well-invested.
What I'd suggest is that you purchase the desired domain name(s) from us and publish your website to this/these domain(s) additionally. For step-by-step instructions on how to do that, please see our tutorial Assigning domains and creating a primary domain. This will give you some time to enhance your SEO performance, and let all your visitors know about the domain change. Please let me know if you have any questions.