Your site is on a free subdomain of gt.tc, which is controlled by InfinityFree.
You can’t set a free subdomain to an A record, and the client area and control panel give you no option to. I’m not sure what you see, but it isn’t A record settings.
That’s considered a sub-subdomain which aren’t supported anymore, though older accounts that had one had them grandfathered in. Visiting the www sub-subdomain of your site redirects me to your site.
Could you please be more specific about what your site looks like on your end compared to what it should look like? This is what it looks like when I visit it:
The base domain unitedweldfab.gt.tc is pointing to a premium hosting IP address.
Did you have this website migrated to premium hosting? If so, you can manage your website through the cPanel of iFastNet’s accounts.
Please do note that you can migrate your website to premium hosting, it does not give you full DNS controls over your free subdomain. To be able to use all features of premium hosting, you should migrate your website to a custom domain (one provided for free with all plans except the Starter plan), or a free subdomain from iFastNet themselves.
For more questions about your websites on premium hosting, please contact iFastNet directly through their support portal, we cannot provide support for iFastNet’s premium hosting here.