Hi Roi,
again!
Please don't fret about being computer challenged ... I'm one who has been there and it doesn't take much to frustrate me when it comes to electronics.
It's really very easy to post on any thread (page) in any forum here on All Things Plants and once you've done it a few times you will get the hang of it. You can practice by commenting at the bottom of this page if you like. Whenever you want to ask a question or make a comment just scroll to the bottom of the page you are on and you will see a box where it says:
Post a reply to (for instance here it says) Ask a Question forum: how to join a particular forum etc.
Your message:
Inside this blue box, just type what you want to say and then click on the green area below that says Finished.
Don't get discouraged, just give a shout if you have any trouble and we'll help you out.