Custom field display

Hi, I have a rather stupid question, but I really can’t get the custom_field tutorial. I want to display a custom field as it is. Nothing more, nothing less. For example:

i’ve added to a post the following:
key=test
value=123

I want to display the value of “test” somewhere in my template with the link of the post it is assigned to.
Just text with a link. That’s it.

thanks in advance and sorry if i’m wasting your time with stupid questions.