FTP Access

Hi.
I’m currently constructing my site but cannot reach my server from my admin panel. I can’t install plugins (I have to FTP them manually to the plugin folder), now I’m being told that my version of WordPress needs updating but because of this inability to reach my server I can’t do it.
I have no trouble creating pages and uploading the media files for them, but for things like plugins and themes I have to manually FTP them.
I am putting the correct info into the ‘connection information; fields but all I get is the red box at the top stating ‘Error: There was an error connecting to the server, Please verify the settings are correct.’
Any advice gratefully received and thanks in advance.
Jack.