Some packages automatically include the display of the URL (Web link). In cases where the URL option is not included in the package, you can buy one for $4.50 when creating the ad. It should be noted that the inclusion of a URL is only allowed in the field intended for this purpose in the ad form.
Note that the URL is present and/or available for the entire life of the ad. There is no need to buy a new URL when renewing the ad.