Welcome!
Hello, [[UserName]]! Welcome to this wiki. You can now
[[Action(edit&template=HomepageTemplate,Create your wiki home page)]]
Edit your ../UserPreferences
Go to [[GetText(PageHomePage)]] and browse this wiki.
Notes
I do not know if [[GetText(PageHomePage)]] would do, but I suppose there is a macro to link to the current home page, even if it was renamed, right?
[[Action(edit&template=HomepageTemplate,Create your wiki home page)]] This only works right if this page is displayed at the address of the username. I suppose that there is a mechanism in place to do this, since MissingHomePage is displayed exactly like this. So no complicated changes needed.
[[UserName]] Is there a Macro that does this? I realise that it is not so important.