So I am trying to personalize my url link for my appointment link
Thanks for your post.
As of right now, we don't offer the option to customize your online booking site URL. It is important to note that the URL will include the text that you've added in the Business Name section of your Account & Settings tab in the Online Dashboard.
I moved your post over to the Feature Requests: Square Appointments thread so that if this feature becomes available, there will be an update posted here.