Be sure your link is not in <noindex> tag and is shown on a page without any use of Javascript, frames etc. Besides, this link can not be found if meaning of the tag's attribute for href <a> doesn't follow the standard described in RFC1738 (e.g.: unnecessary free-space before site-URL).

These are code-signs for three possible modes. "n/f" means this link was not found on the page, "n/a" means this site is unavailable now, and "n/t" — that this link exists on a page but has no text (e.g., this is a picture as a link). You can also use Help to see the meaning of this codes in the program's work.

In this case it is necessary to view this number of links as total number of links given by Yahoo to this site at the request for their receipt.

This is a graphical mark of the link's type. You can get a reminder about the type by placing mouse-cursor on the graphical mark or using Help of the software where all the explanations for graphical marks are given.

Since 2.5 version you can set your own formula for calculation. This can be turned on in the dialog-box of the software-parameters (Service > Other parameters... > Cost calculation).