I will assume your base code is UEB. Use a transcriber-defined indicator (UEB 3.26) and place it after the word within the text. That symbol should be explained either in a TN at the site or on the TN page. The indicator is placed within the text just to let the reader know there is a reference note that applies to this text. Put the footnote at the bottom of the print page according to Formats guidelines (separated from text by the note separation line). Do NOT repeat the transcriber-defined indicator preceding the footnote because there is no print reference mark.