In order to get the access to IPMI, you need to access the Client Area and go to the Servers tab.
Select Service Management next to the server you want to get an applet for.
On the new page, click on IPMI, enter your IP-address (you can see it on https://whatismyipaddress.com/) and click Save. This will create a request for Java Applet formation.
If the data was entered correctly, you will see a corresponding notification. Next you need to click a button Download Java Applet.
Afterwards, you need to save and launch the downloaded file.