Hi @Alaayehia, Your store domain name or website address is a crucial step to take.
You can always learn how to merge your online store with the domain name through this link: https://community.zvendo.com/knowledgebase/how-to-buy-and-add-domain-name/
You are entitled to choose your domain/URL or settle for your primary domain, with keeping in mind that your primary domain will go as something like this: http://zvendocustomer.zvendostore.com, or you can customize your domain, as it is your store and you have the free will to decide on what domain you want to reflect it.
If you wish for a customized domain, you can simply change it form domains from your online store, without any further fees charged.
For a third party domain, which will go as something like this: http://yourbrandname.com, then it will have to be purchased from a third party provider and then connected to your online store through domain mapping to be applicable.