POWA doesn't show queries executed

Dear all

I have successfully installed POWA (http://dalibo.github.io/powa),
including all required extensions, see the following Printscreen of its
operation of end email.

But when executing queries in psql- comand line, this queries are not
monitored by powa. I have checked that only Postgresql internal catalog
queries are shown. .
I need the Optimize Query functionality and mainly the suggestion of
indexes.
But that does not work, by clicking on the optimize query option, returns
zero suggestions.

See below that I created a scenario, with a table with a large amount of
data, to check if the tool would suggest some index, and when making a
complex query, no index is suggested.

Someone uses POWA, knows if they have to configure something so that the
queries are monitored and show suggestions ??

---------------------- Printscreens of my environment partially
working:--------------

https://sites.google.com/site/eletrolareshop/repositorio/powa1.jpeg
https://sites.google.com/site/eletrolareshop/repositorio/powa2.jpeg
https://sites.google.com/site/eletrolareshop/repositorio/powa3.jpeg

-------------------------------------------------------------------------------------------------------
------------------------ scenario to verify the suggestion of indices
--------------------
postgres=# create table city_habitant (number_habitant text);
CREATE TABLE
postgres=# insert into city_habitant (number_habitant) select 'São Paulo'
from (select generate_series (1, 4000000)) a;
INSERT 0 4000000
postgres=# insert into city_habitant (number_habitant) select 'Rio de
Janeiro' from (select generate_series (1, 8000000)) a;
INSERT 0 8000000
postgres=# insert into city_habitant (number_habitant) select 'Recife'
from (select generate_series (1, 6000000)) a;
INSERT 0 6000000
postgres=# insert into city_habitant (number_habitant) select 'Santos'
from (select generate_series (1, 2000000)) a;
INSERT 0 2000000
postgres=# insert into city_habitant (number_habitant) select 'Chui' from
(select generate_series (1, 6)) a;
INSERT 0 6
postgres=# SELECT number_habitant, count(number_habitant) FROM
city_habitant GROUP BY number_habitant;
number_habitant | count
-------------------+------
Rio de Janeiro | 8000000
Recife | 6000000
Santos | 2000000
São Paulo | 4000000
Chui | 6
(5 rows)

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