Instruct to use PWD in self-paced mode

slides/common/prereqs.md

@@ -66,6 +66,8 @@ Misattributed to Benjamin Franklin
 
 - Join the chat room on @@CHAT@@
 
+<!-- ```open http://container.training/``` -->
+
 ]
 
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@@ -197,6 +199,32 @@ If anything goes wrong — ask for help!
 
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+class: self-paced
+
+## Get your own Docker nodes
+
+- If you already have some Docker nodes: great!
+
+- If not: let's get some thanks to Play-With-Docker
+
+.exercise[
+
+- Go to http://www.play-with-docker.com/
+
+- Log in
+
+- Create your first node
+
+<!-- ```open http://www.play-with-docker.com/``` -->
+
+]
+
+You will need a Docker ID to use Play-With-Docker.
+
+(Creating a Docker ID is free.)
+
+---
+
 ## We will (mostly) interact with node1 only
 
 *These remarks apply only when using multiple nodes, of course.*