Never mind the PATH variable for now. Let's first find out in which location it is installed.
in a terminal window. I expect that it's in /usr/local/stata (NOT /usr/local/stata11 as in my other post).
In that case
should start Stata (or whatever path the locate command showed).
If that works, you can add that path permanently to your PATH variable to save you from always typing the full path:
Note that for the export command you use only the path to the folder, not the complete path. Restart the terminal and type
echo 'export PATH=$PATH:/usr/local/stata' >> .bashrc