How to POINT my store to a different website

Hi guys so I own a website, lets call it for hypothetical www.HOMESTEAD.com

Again my store is not that, just want to use that as an example.  Then I also own

STORES.HOMESTEAD.com  

Somehow my billing "expired" for a day and both my website and domain went off.  I was a homestead customer and they changed me to BIG COMMERCE years ago, minus my permission for God knows what reason, so this is once again a HOMESTEAD created issue.  Anyways, they want me to pay both HOMESTEAD and bigcommerce.  I don't understand it

Anyways I paid and turned the store back on and my website which is famously known as www.HOMESTEAD.com is not working but only the STORES.HOMESTEAD.com is working.  So the store fully functions under the second name that HOMESTEAD gave me, which is beter then nothing but my sales for 24 hours have gone to ZERO since no one can find my website

HOW do I immediately point my store back to the www.HOMESTEAD.com website instead of the stores.homestead.com being the "main website" or domain  I guess you would call it? Please and thank you!

wesley