[Misiur]

pawn Код:

ShowPlayerDialog(playerid,RADIO,DIALOG_STYLE_LIST,"Radio Menu","Song1\nSong2\nSong3\n((HERE))\nOff","Select", "Close");

Now, onDialogResponse if the listitem is equal 3 you need to show next dialog which will be dialog with an input

pawn Код:

ShowPlayerDialog( playerid, 9885, DIALOG_STYLE_INPUT, "Stream","Please enter your custom URL.", "Stream", "Cancel" );

And then you use inputtext as an url