Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
inserto, 1, v. a. freq. [id.], to put into, insert; with dat. (poet. and post-Aug.): clipeoque sinistram Insertabam aptans, Verg. A. 2, 672: dextras catenis, Stat. Th. 12, 460: insertans commissuris secures, Petr. 97.