Would like to add myself as uncredited cast in movie

William: Do you already have any other credits listed in IMDb already? If so, you can get this cast listing entered into IMDb, with your character listed as Navy Lieutenant and an (uncredited) attribute.

However, if you have no other work already listed in IMDb, you may not be able to get this role listed. As indicated at https://help.imdb.com/article/contribution/filmography-credits/i-worked-on-a-title-but-did-not-receive-a-screen-credit-can-it-be-listed-on-imdb/G3BDEA5Y4U9LP9BW#:

The decision to display uncredited/unbilled credits is made on a case-by-case basis and there are several factors that may influence our choice. ...

You need to have at least one pre-existing credited entry in the database. We will not display filmographies consisting exclusively of uncredited work. We may make an exception in very rare/specific circumstances (e.g. on movies released before 1990, episodes released before 2000 and/or for high-profile credits, such as an uncredited cameo appearance by a celebrity), but in most cases we will not list an uncredited credit unless you have a pre-existing credited filmography.

In this case, you are dealing with a TV movie from 1992 (Lady Against the Odds (1992)) so it is unlikely that IMDb would make an exception if you don't have a pre-existing credit.

However, if you do get an actual credit in an IMDb-listed title, you will then have a proper filmography and your prior uncredited work, including Lady Against the Odds, would be eligible for listed in IMDb with the (uncredited) attribute.

I hope this helps.