Accessing controls from navigation form (1 Viewer)

I have a main navigation form which name is MainUtas, one of his tabs or navigation buttons is NavigationButton9
which Caption is Quality and opens the QualityNav form (which I think becomes a subform). In QualityNav I have
more navigation buttons, one is NavigationButton7 which caption is Training Records and opens the RecordsTraining form,
where I have Text5 (a textbox). In RecordsTraining I have an unbound ComboBox (Combo2) from where Text5 control
source is: =[Combo2][Column](3). I also have a button that opens a report, which source is a query based on the value
of Text5. My issue is: when I had the RecordsTraining form by itself everything ran fine, but now I'm getting the enter the
parameter pop-up when accessing it within the navigation form. I tried following the path on the builder but from the main
navigation is not possible.I tried this also but didn't work: [Forms]![MainUtas]![QualityNav].[Form]![RecordsTraining].[Form]![Text5].
Any help will be appreciated it. Thanks

The inbuilt navigation forms are a real pain in the backside to use. Most seasoned developers on here avoid them like the plague and simply make their own, however this thread may help https://www.access-programmers.co.uk/forums/showthread.php?t=237494

I got it thanks, here it is:

[Forms]![MainUtas]![NavigationSubform]![NavigationSubform].[Form]![Text5]