Since your user id is unlikely to be shown here (unless you are Iain 
), you will need select the "Not Listed" option
The "Not Listed" option will offer you the chance of typing the user id. You need to write your UNIX one, eg usv
The password should be the same one that you will use with the UNIX account everywhere else.
In case you get this screen, just choose "Cancel". You should get the right timezone by default
The same with this one
Location services must be disabled. There is not much point anyway, as they only location you "could" give away is Bologna. But there is no GPS in the VDI servers 
Here you can choose the English (UK) option. We have a further article on how to to configure, later on, the system to work with the MacBook Pro keyboard. See How to map the Mac keyboard in Linux VDI - Linux Virtual Desktop VDI FAQ
Just skip this step at this point. You can access all Microsoft services via a web browser, even though you may want to configure OneDrive later on. See How to configure and mount OneDrive - Linux Virtual Desktop VDI FAQ
And you are ready indeed
You do have some tutorials on how to perform some basic tasks. Keep in mind that the graphical interface in Red Hat 8 is quite different to the KDE we used to have in OpenSuSE, so perhaps it is worth having a look at this.
If you have any further questions please check Linux Virtual Desktop - VDI: Documentation