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To sort data in PostgreSQL using indexes, you can follow these steps:

1. Create an index on the column(s) you want to sort by. For example, if you want to sort by the "name" column in a table named "people", you can create an index using this statement:

CREATE INDEX people_name_idx ON people(name);

1. Use the ORDER BY clause in your SELECT statement to specify the sorting order. For example, if you want to sort the "people" table by name in ascending order, you can use the following statement:

SELECT * FROM people ORDER BY name ASC;

1. PostgreSQL will use the index you created earlier to perform the sorting operation faster than if it had to scan the entire table.

Note that creating indexes can increase the performance of your queries, but it can also slow down insert, update, and delete operations. Therefore, you should only create indexes on columns that are frequently used in sorting or filtering operations.