Thanks to you Gavin and welcome.

As others have said, we can all help you to
become comfortable. Take it easy and remember
that if you are unsure about committing something
then you can still put a patch in Jira.

Start by putting your entry in site-author/content/xdocs/who.xml

Then try adding a small text file to be sure that
your SVN client is configured properly, e.g.

cd $FORREST_HOME
echo "hello" > test.txt
svn add test.txt
svn status
svn commit test.txt

svn delete test.txt
svn commit test.txt

-David