When you open a Timeslot Template under CA BSI you could see that the details appear in gray and that will not you permit you to modify this Timeslot like in the screen shot.
The browser is not running the java applet. This is because the Internet Explorer have locked down java applets.
Set security to the to minimum level and then also go into the java control panel and set security to the lowest setting, also re-enable security prompts there
I hope in the future they rewrite that
with no applets
1. Open the Control Panel
2. Open the Java Icon
3. Enter the tab "Security"
-> Modify the security to a minimum level
5. Under the tab "Advance"
-> Under Mixed Code, security verification
(*) Enable - hide Waring and run with protections
6. Reopen the Internet Explorer
7. Open the timeslot template
8. Accept the new security
Now you should be enable to see the timeslot: