You don't want to upload the "Omnipay-Blesta-Module-1" folder to the server. You want to upload its contents. That folder should contain two folders: "components" and "vendors". Upload those to the Blesta web directory on your server. There should already be a "components" and "vendors" directory in Blesta's web directory, and the folders will be merged when you upload them. Then, you should have the gateways listed in Blesta.