Windows File Explorer defaults are to hide the %USERPROFILE%\AppData folder. You can change this setting, but it is often more efficient to use a PowerShell terminal:
PS> cd $env:USERPROFILE\AppData\Roaming\SNAP\var\log
PS> more .\messages.log
Note that you can easily copy and paste text from a terminal to forum posts. Windows GUI tools are fine until something doesn’t work as expected, then you will find that learning some basic command-line procedures (starting with the above link) is well worth the time required.