You can confirm how much space your card has by accessing the system’s browser and selecting the memory card icon. In this menu, you can choose to delete game save files to make more free space available. To access the browser, make sure no disc is in the console and turn it on. This will bring up the main system menu, including the browser.
If you need to manually enter your ISP settings and don’t know the particular information that needs to be entered, consult your ISP documentation and your primary computer used to access the Internet.