C1 to put something inside something else插入
Insert the key in/into the lock.将钥匙插入锁中。
C1 to add writing to a text, form, etc.插入,添写(文字、表格等)
I've filled in the form, but you still need to insert (= add) your bank details and date of birth.我已填了表,但你还要添上你的账户详情和出生日期。