General questions to build the site again

[greekbb]

hey i have 68 c v4.0.1 and i want and the site is http:// www.cy-ads.net. It is my dad's site for some time ago and now i want to build it properly and make some changes so i can run it.

I need to put the calendar addon but i dont know how. I saw on the ftp files that in /javascript there is a calendar file but i dont know how to activate it.

Also because i dont know much on this, is this the latest version i have installed? How can i update it ?

Please let me know and give me all your support you can in order to build the site again with better results. Thanks alot!