added sth to intro presentation

intro_presentation/index.html

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 <p>6. <strong>Don't switch of / shutdown the computer during the two days !</strong>
 
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+
+## How to upload the notebooks to polybox
+
+<p>1. Start Terminal (click `activity` top-left corner)
+<br/>
+<br/>
+
+<p>2. Enter <br/><br/><div style="font-family: Roboto Mono; font-size: .8em; color: #0069B4;"><center>ln -s .tmp/ml_workshop $HOME</center></div>
+<br/>
+
+<p>3. You should find the notebooks in `ml_workshop` in your homefolder.
+<br/>
+ . 
+<p>4. Open `https://polybox.ethz.ch` to upload your notebooks manually . 
+<br/>
+---
+
 
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