I want to link another JotForm to one I have already created

the information I "googled" uses solutions based on an old version of JotForm

thanks.

I am not 100% sure if I understood your concern. Anyway, do you want clone a form over to your account? If that's what you wanted, then here's a guide on how to do it.

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

If you are trying to transfer  or share forms with other account, then you can check this guide
https://www.jotform.com/help/342-How-to-transfer-or-share-forms-and-data-with-another-account

Hope that helps. Let us know if you have any other concerns.