Releasing a mechanics lien is an extremely simple process. Much like the lien filing, it simply requires that a lien release form include the correct information then get filed with the county recorder's office.
You can find a free, downloadable template for Indiana lien releases, here: Indiana Mechanics Lien Release Form. Further, you can obtain the address and filing fees of the appropriate county recorder here: Indiana County Recorder Directory.
Finally, keep in mind that there are services out there - including Levelset - that can help to simplify the process. To order a mechanics lien release through Levelset, you can get the process started here.