I guess you use FTP over TLS, which is the default protocol used by FileZilla. Dependent on your FileZilla version, it may or may not display a SSL security dialog. If it does, verify the info as highlighted in the following screenshot:
You can see the Protocol is TLS1.2 (SSL 256); and the certificate's common name matches drivehq.com domain name. To avoid seeing this dialog again, you can choose to trust it.
If you are already connected, you can click the lock icon at the bottom-right corner of FileZilla window. Please see the screenshot below. It will display the above SSL certificate dialog: