why google does not find Forum?

Well, you could always just type up the exact URL, but to find it on search engines, here's what you have to do;
Admin Panel --> General --> Forum Promotion --> Search Engines --> Google (or whatever search engine you choose) --> Do whatever it says. 
Hope this helped.

Thank you. I have already done. but after one week is not in the browser

Could you please 

70-462 provide a screenshot and the url of your forum ?

Hello @Sonne

Thank you for your Report on this matter.
It can take upto 3 months for your forum to be added to google as lots of sites are made as spam sites so google can take longer to add your site to the search page.

Did you do the following things in your ACP ?

ACP General tab    Forum promotion Search engines Add your Google Meta Tags then save.

if you have done that and see Google show up on your forum at the bottom of your site under the Bots system then Google is working and is looking at your forum.

To make sure your forum is getting the most out of google make sure all your forum is seen by guests so google can see your full site .

Hope that helps

APE

Thank you. I did so. but it soon disappeared google. Is it good?

you may also want to read this set of topic's
https://help.forumotion.com/t136804-was-my-site-penalized-by-google
https://help.forumotion.com/t138643-how-to-set-up-google-webmaster-tools-for-your-forum
https://help.forumotion.com/t138146-analyze-your-forum-traffic-with-google-analytics
https://help.forumotion.com/t137080-how-to-optimize-keywords-on-my-forum

if your forum was on google then you will need to read link number one

APE