Ok, so lets unpack this...
We are Toastmasters here, but FreeToastHost is not directly connected to toastmasters.org, so there is no way you can get a URL that is associated with toastmasters.org. WHQ "owns" that URL and only they get to define what content is accessible via that domain name.
Your options are a different custom URL like you have now (you would have to talk to your domain registrar about that and likely pay another registration fee to them) or use a website alias (free) with your FTH website. e.g.
Code:
https://clayton.toastmastersclubs.org
The base URL for FTH if you do not use a custom domain is "toastmastersclubs.org" and cannot be changed (unless you use a custom domain).
In any case, as FTH saves your content in our MySQL database, your data is saved regardless of the way you access it.