Using Joomla

[#1]

I want to build a website on my Plus.Net account using Joomla CMS. I can't find the Joomla install on the control panel. Can you help please?

[#2]

What you put in your Plusnet webspace is up to you, and it is your responsibility to install it using packages you download yourself from the respective developer's website. A package such as Joomla would have to go on ccgi space because it needs PHP and MySQL.
However Joomla 2.5.x requires MySQL version 5.0.4+ whereas that on ccgi is still 4.1.11, so the minimum requirements are not met.

[#3]

Looks like Joomla is not an option. What do you suggest I use?

[#4]

Most, if not all, packages these days require MySQL 5.x so the options are potentially non-existent.
Using a special hack to change the MySQL version requirement to '4.1+' it is possible to install WordPress 3.5.1; I know the distributed release works, though it's possible optional plugins (particularly different themes) might not do.
The hack is built into the 'update' script published in Reply #21 on the Wordpress 3.2 and higher topic. Although that script was published as an 'update' script* it will also do a fresh install. In the latter case, after using the script to load the files it is necessary to run the set-up script. See Installing WordPress on the WordPress website.
* Note: the built-in updater will fail, it is necessary to use this script for updates.
Release of WordPress 3.6 is imminent, I don't know if that will work with MySQL 4.1.

[#5]

Why are you even suggesting using CGI? It does not work.

[#6]

See http://community.plus.net/forum/index.php/topic,115341.0.html