Af_psql_trgm plugins Yunohost not working?

Hello, I used Ttrss with my Yunohost server and tried to use the plugins Af_psql_trgm, but it doesn’t seam to work.

I install the package for Debian, but after reading multiple post I may need to install the module in the Ttrss database. The problem is I can’t enter to the database, so maybe it’s a problem with the command I used or the shell user (admin) or Yunohost?

Here are some of the command that I used.

sudo apt install postgresql-contrib

sudo -u postgres psql --dbname=ttrss

Sorry, user admin is not allowed to execute ‘/usr/bin/psql --dbname=ttrss’ as postgres on mg-dev25.com.

I tried to execute the step in this last post.

Thanks for your help.