How to create new read-only user on postgres

How to create new read-only user on postgres

Hi,
I need to set up a DB user (Postgres) to read some data from servicedesk db.
I tried to follow this official guide https://pitstop.manageengine.com/portal/en/kb/articles/remote-read-only-access-to-database-for-postgres-customers , but I got stucked at the first step 'cause I don't know the superuser's password of postgres user suggested on the article  (createPostgresUser.bat -sU postgres -sp <super-user-password> -U <new-username> -p <new-password> -r readonly) .

I also tried to use sdpadmin user but it doesn't solve as he is not a superuser.

Please could you share the postgres's superuser password, or give me an alternative way to get my goal (readonly user on servicedesk db)?

Thank you
Nightz
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