Migrating WP site from Sitegrounds to Infinity Free - database connection error

Thank you - but on one of the comments on this thread Is there a guide to migrate my website to Infinity Free? - #3 by SPARSHTECHER.EU.ORG - which is where I found the first link that you sent, a moderator recommends not to use WP automatic backups at risk of being suspended.

Anyway, I don’t think I have uninstalled WP on my old host (should I have done that?), I definitely have installed it with Softaculous , what do you recommend that I do now? I still think my problem is that the domain isn’t properly linked with the database, and that in Infinity Free “My Account” page (the one which is split into Cpanel on the left and FTP on the right), the details on the bottom left for My SQL Database do NOT reflect the database name that I created to install my SQL files. And so far I have not been able to edit the file name that shows up there. I have added a screenshot from My Account page, the Database Name has XXX and not what I renamed it to. Clicking on “my SQL database” does not let me edit it.

In other words, I have created a database and uploaded files but this is not reflected in my account.