Login with your m or s number and the corresponding UT password. If it doesn't work the reason could be that you are not yet it the corresponding UT mailing list (CTW-THW Members (Plus) or CTW-THW-Students).
At the left of your window is the navigation bar where you find the most important topics and a link back to the start page. The wiki is separated in mainly three different blocks:
But it is up to you to fill it with more interesting topics.
If you do not know how a wiki works and you want to test some things, then learn to make your first steps on the playground. It's meant for this purpose. The information about the syntax can be found here. Before you start working in the “real” wiki, make sure you understood how the sub folder (namespaces) structure works, otherwise you will mess up the wiki structure .
Some important remarks on the wiki:
Now that you know how to use the wiki it's up to you to fill it with information related to the group. In any case fill in the following things: If you are a student fill in your personal information here and if you are a stuff member add which software you are using or what kind of experimental setup you are working on.
If you think the wiki misses an important feature, just implement it!