Activate Index

Hi!!
This is my first post to the list. I have a problem.
I have a table with a two index , int4, but when I do a search using the
field indexed but when I applied an explain to the query it says Seq Scan ,
I mean , that it doesnot use the index.
I cant use the cast field::int4 because I use delphi and delphi does not
support this.
I know there is a command to activate index aand always postgrres will be
the index
Which are this command???
Anyone knows?

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