fix db instructions

README.md

@@ -102,7 +102,16 @@ Note that you won't be using the `dnf` instruction here since DNF is the package
 
 If you are feeling adventurous you can install postgresql using [docker](https://github.com/levonet/ansible-docker-postgres).
 
-Either way, you need to install this on youd DB machine, which should be the one with the least amount of RAM.
+Either way, you need to install this on your DB machine, which should be the one with the least amount of RAM.
+
+Go check the configuration of `/etc/postgresql/13/main/pg_hba.conf` and `/etc/postgresql/13/main/postgresql.conf` to make sure you can connect from `0.0.0.0`.
+
+On the `pg_hba.conf` file add a line like that at the end:
+```
+host    all             all             <the netmask you want to add>            md5
+```
+
+Also change the `listen` instruction to `*`.
 
 ## Install Nginx