You can use only the part of the address without the country extension in the respective field. So if you have test.blogspot.com you can just enter test.blogspot and InLinkz will match the backlink.

Moreover you can remove the www. part as well as some people may link directly without it. It is still safe to match as a backlink as InLinkz searches only inside link tags (and not in the rest of the target blog's text)