Well, alright, let me rephrase it:
There is no replacement name for the link (beside the fact that is says http://). A user clicks on the button, a javascript pop-up pops out, the user must insert a valid URL, then, this is entered in the textarea automatically. If they post it, you can see the full URL. Now, I want to make it possible to rename this URL. I guess it is logical to have a second javascript pop-up which says: "what will be your url name replacement" or something else.
I could make this, but this is standard and not renamed by the user. I want it to be renamed by the user.