umetnuti

1. to insert; to put in
   Umetnite karticu u bankomat i unesite PIN. — Insert the card into the ATM and enter your PIN.
   Umetnula je fotografiju između stranica knjige. — She slipped a photo between the pages of the book.
2. (of text) to insert; to add
   U tekst sam umetnuo još jednu rečenicu. — I inserted one more sentence into the text.

Used as umetnuti something u + acc.; the imperfective is umetati.