Updated README.md with more detailed instructions.

README.md

-# ansible script to setup otree instances
+# ansible script to setup multiple [otree](https://otree.readthedocs.io/en/latest/) instances with gninx reverse proxy and supervisor
 
 ## preparation
 
-### place ssl/tls certificates and key-file (unfortunately not scriptable)
+### place ssl/tls certificates and key-file (unfortunately not scriptable due to security best-practices)
+1. Use ``scp mycert.crt user@host:/home/user/`` and ``scp mycert.key user@host:/home/user/`` or use [WinSCP](https://de.wikipedia.org/wiki/WinSCP) to copy over the certificate files.
+2. Establish a ssh connection onto your server.
+3. Then move the certificate files into place: 
+
+``sudo mv /home/user/mycert.crt /etc/ssl/certs/``
+
+``sudo mv /home/user/mycert.key /etc/ssl/private/`` 
+
+4. And set the permissions correctly: 
+
+``sudo chown root:root /etc/ssl/certs/mycert.crt /etc/ssl/private/mycert.key`` 
+
+``sudo chmod 644 /etc/ssl/certs/mycert.crt`` 
+
+``sudo chmod 600 /etc/ssl/private/mycert.key``
+
+
+### install ansible and clone this project on your server
+1. Establish a ssh connection onto your server.
+2. And install git and ansible:
+
+``sudo apt update``
 
-### install ansible and clone this project
 ``sudo apt install ansible git``
 
-``git clone https://gitlab.rrz.uni-hamburg.de/bax1489/otree-ansible.git``
+3. Then clone this ansible project:
+
+``git clone https://gitlab.rrz.uni-hamburg.de/bax1489/otree-ansible.git ~/otree-ansible/``
 
 ### configure playbook
-Adapt your ``group_vars/otree_servers.yml`` from the provided example accordingly:
+1. Copy the example config ``cp ~/otree-ansible/group_vars/otree_servers.yml.example ~/otree-ansible/group_vars/otree_servers.yml``
+
+2. Adapt your (inventory-)config with ``nano ~/otree-ansible/group_vars/otree_servers.yml`` from the provided example accordingly (press "Strg-x", then "j" to save):
+
+```
+otree_master: "otree1"
+# which otree instance should be delivered as default
+otree_domain: "otree.company.org"
+# fqdn of the otree server
+otree_group_name: "otreeusers"
+# linux group for the otree users
+
+otree_users:
+# list of users for the available otree instances
+  otree1:
+  # linux username
+    override: yes
+    # should an existing otree environment be overriden
+    pre_release: no
+    # should the pre-release version of otree be installed
+    redis: "redis://localhost:6379/1"
+    # redis queue. Note don't use a slot twice, there are 16 slots available (0-15)
+    database: "sqlite:////home/otree1/db.sqlite3"
+    # which database should be used. Examples: "postgres://USER:PASSWORD@HOST:PORT/NAME" or "sqlite:////home/user/db.sqlite3"
+    admin_pw: "mysecretpw1"
+    # otree admin password
+    auth_level: "STUDY"
+    # auth level, possible values: "STUDY", "DEMO"
+    secret_key: "safaho9awefzuwf"
+    # django secret key, use differet in different instances
+    production: "1"
+    # LOG-LEVEL, set to None ("production: ") to enable further debug messages.
+    port: 8005
+    # port which is used by this instance
+```
 
 ### (optional) upload otree project
-If no git-repository with your otree project is provided, you can place a copy in ``files/<otree_username>/``.
+1. If no git-repository with your otree project is provided, you can place a copy of the project files (with scp) in ``files/<otree_username>/``.
 
 And now run the playbook.
 
 ## change the configuration
-Adapt ``group_vars/otree_servers.yml`` and run the playbook again
+1. Adapt your inventory-config again with ``nano ~/otree-ansible/group_vars/otree_servers.yml`` and run the playbook.
 
 ## run the playbook
-Run ``ansible-playbook site.yml``.
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+1. Change directory: ``cd ~/otree-ansible/``
+2. Run: ``ansible-playbook site.yml``
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