Set up a french version (texts provided) of an a squarespace travel website

my website is 95 percent done in English with texts. I have the translations of the text in French ready to go. I need to set up the website to be bilingual. when visitors arrive, they must be able to choose website in French or English. Domains are purchased, website is not currently live
I will provide access codes to website which is 95 complete in Egnglish, you will need to set up the French website, and I will provide already prepared texts.

https://www.youtube.com/watch?v=2nk3mE_bF6I