Assuming you are using a fake Windows installation, you install
applications into Wine in the same way you would in Windows: by
running the installer. You can just accept the defaults for
where to install, most installers will default to "C:\Program
Files", which is fine. If the application installer requests it,
you may find that Wine creates icons on your desktop and in your
app menu. If that happens, you can start the app by clicking on
them.
The standard way to uninstall things is for the application to
provide an uninstaller, usually registered with the "Add/Remove
Programs" control panel applet.
To access the Wine equivalent, run the uninstaller
program (it is located in the
programs/uninstaller/ directory in a Wine
source directory) in a terminal:
$uninstaller
Some programs install associated control panel applets, examples
of this would be Internet Explorer and QuickTime. You can access
the Wine control panel by running in a
terminal:
$wine control
which will open a window with the installed control panel
applets in it, as in Windows.
If the application doesn't install menu or desktop items, you'll
need to run the app from the command line. Remembering where you
installed to, something like:
$wine "c:\program files\appname\appname.exe"
will probably do the trick. The path isn't case sensitive, but
remember to include the double quotes. Some programs don't
always use obvious naming for their directories and EXE files,
so you might have to look inside the program files directory to
see what was put where.