Language selection in boutique theme

Hi,

I am not sure that I can understand clearly you mean. If you want to use another language, you can select here: https://prnt.sc/sb75pp
And if your site is single language, you can use Loco Translation plugin to translate. It is the free plugin so you can translate manually.

If you want to get any helps, pls provide me your admin and take the screenshots, I will check for you
Regards,
Yame