after your locator ended scanning the items and you exported what you needed you can enter the listing generator

you'll see the list of exported files, click on a file you exported (usually the first one)

select the settings (seller account, template,tag, limit) and then click 'generate' to start the process

after the generator finished (status: Done) you may enter the file and see how many items were listed (loaded into eBay store) and how many - failed (by clicking on failed you'll see the failure reason)

if you want to try to reload the files that failed you may press 'back to generator', select the settings and generate again