diff --git a/abra.sh b/abra.sh
index b12de65..5ce711e 100644
--- a/abra.sh
+++ b/abra.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 export FPM_TUNE_VERSION=v4
 export NGINX_CONF_VERSION=v4
 export MY_CNF_VERSION=v4
@@ -18,3 +20,19 @@ install_apps(){
         run_occ "app:install $app"
     done
 }
+
+set_app_config(){
+    APP=$1
+    KEY=$2
+    VALUE=$3
+    run_occ "config:app:set $APP $KEY --value $VALUE"
+}
+
+install_bbb(){
+    URL=$1 # https://talk.example.org/bigbluebutton/ (trailing slash!)
+    SECRET=$2 # bbb secret key
+    install_apps bbb
+    set_app_config bbb app.navigation true
+    set_app_config bbb api.url "$URL"
+    set_app_config bbb api.secret "$SECRET"
+}