firstly thanks for your ideas. Let me try to answer your questions..
1. You all right, this search engine cannot search any term like original site search engine so because of this condition, when you go to new search engine then press Enter activity (without writing any search term) will take away you to directly Paint.NET forum search engine, so at the same time this is another way to going to Paint.NET search engine page.
2. If this happen, then i can renew the search engine same as site admin can change the site url. I mean this is not the unchangeable.
3. As i mentioned before, this engine carries the user to the search result page. So when user enters any criteria and put in action, then user will directly go to the Paint.NET searc result page.. So, no extra ad's no change any rule of site..
4.Maybe this will cancelled by admin same as before one (i don't have any idea) but only i think that, some users want to search in Paint.NET quickly.
As a result; i don't have any ability to make perfect tutorial because i am a novice user, but i know how can i make usefull (as for me) small software helpers. then, just i want to be helpful..
Sorry for poor english (if exist :? ) but i'am not british..
Best regards ...