diff --git a/asciidoc/install-asciidoc.adoc b/asciidoc/install-asciidoc.adoc
index 70a8f29..99e9a40 100644
--- a/asciidoc/install-asciidoc.adoc
+++ b/asciidoc/install-asciidoc.adoc
@@ -49,7 +49,7 @@ TIP: swarmlab-adoc convert all *.adoc files recursiva in html5 and pdf
 [NOTE]
 ====
 ```
-docker run --rm -v $(pwd):/documents/ registry.swarmlab.io:5080/swarmlab-asciidoctor asciidoctor --safe -b html5  -a theme=flask -a toc2 -a toc-placement=right -o ./path/to/FILENAME.html   ./path/from/FILENAME.adoc
+docker run --rm -v $(pwd):/documents/ registry.vlabs.uniwa.gr:5080/swarmlab-asciidoctor asciidoctor --safe -b html5  -a theme=flask -a toc2 -a toc-placement=right -o ./path/to/FILENAME.html   ./path/from/FILENAME.adoc
 ```
 Please note, there is a **.** in ./path
 ====
diff --git a/docker/install.adoc b/docker/install.adoc
index 30706de..49a99d6 100644
--- a/docker/install.adoc
+++ b/docker/install.adoc
@@ -67,11 +67,11 @@ $ sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
 [[cheat-error]]
 == On Error:
 
-=== Get https ://registry.swarmlab.io:5080/v2/: x509: certificate
+=== Get https ://registry.vlabs.uniwa.gr:5080/v2/: x509: certificate
 
 ```
 Pulling  ...
-ERROR: Get https://registry.swarmlab.io:5080/v2/: x509: certificate signed by unknown authority
+ERROR: Get https://registry.vlabs.uniwa.gr:5080/v2/: x509: certificate signed by unknown authority
 ```
 
 - run 
@@ -83,7 +83,7 @@ $ sudo su
 - copy-paste lines
 
 ```
-registry_address=registry.swarmlab.io
+registry_address=registry.vlabs.uniwa.gr
 registry_port=5043
 mkdir -p /etc/docker/certs.d/$registry_address:$registry_port
 openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /etc/docker/certs.d/$registry_address:$registry_port/ca.crt
@@ -102,7 +102,7 @@ openssl s_client -showcerts -connect $registry_address:$registry_port < /dev/nul
 === Error response from daemon
 
 ```
-docker: Error response from daemon: Get https://registry.swarmlab.io:5080/v2/: dial tcp: lookup registry.swarmlab.io on [::1]:53: read udp [::1]:56425->[::1]:53: read: connection refused.
+docker: Error response from daemon: Get https://registry.vlabs.uniwa.gr:5080/v2/: dial tcp: lookup registry.vlabs.uniwa.gr on [::1]:53: read udp [::1]:56425->[::1]:53: read: connection refused.
 ```
 
 Try again!
diff --git a/header.adoc b/header.adoc
new file mode 100644
index 0000000..6caffd1
--- /dev/null
+++ b/header.adoc
@@ -0,0 +1,5 @@
+[options="header"]
+|=======================
+|http://docs.swarmlab.io[Home] icon:home[link="http://docs.swarmlab.io", window="_self"]|http://docs.swarmlab.io/Howtos[HowTos] icon:wpbeginner[link="http://docs.swarmlab.io/Howtos", window="_self"]|http://docs.swarmlab.io/lab[Labs] icon:mixcloud[link="http://docs.swarmlab.io/lab", window="_self"]
+|=======================
+[.right.text-center]