How do I use components in Delphi 2007?

I've been trying for a while now to use pre-installed functions in Delphi like the readlnwait procedure in Indy 10. Every time I try to compile it it tells me that the function does not exist. I've checked the components menu and they are all installed. Has anybody got any ideas why it doesn't work? Is there something I should be declaring in my program?