if you did installed one of the pre-made layouts already, you need to clear WordPress first with https://wordpress.org/plugins/wordpress-reset/ but please notice that this plugin will remove all current settings, pages, posts, etc.
Your 2nd step is WRONG! You must set Front page (Home) and Posts page (Blog). We don't know how it is called in your language but we are telling you how to do it in English version. Of course if all pages has been imported properly because we don't know how your server works and if it's ok with demo importer.
If you have any questions, you should use English only. We do not speak Russian.
However, we checked your site and it's not true that you did imported Be|Blogger because you imported different demos in the past. Currently, you got Be|Agency. Like we previously wrote, you supposed to clear whole WP with https://wordpress.org/plugins/wordpress-reset/ because at this moment you got different demos than you are saying.
Yes, the plugin will clean everything like we wrote previously: posts, pages, etc. If you don't want to lose posts for example, then you must clean all things like pages, portfolios, etc manually. After that, you must import demo once again and set IMPORTED HOME page as FRONT PAGE under Settings > Reading section like we told you above.
Visit each section under dashboard and just remove every page, portfolio item, testimonial and other one by one. If you imported several demos, then it may take a lot of time.
Comments
if you did installed one of the pre-made layouts already, you need to clear WordPress first with https://wordpress.org/plugins/wordpress-reset/ but please notice that this plugin will remove all current settings, pages, posts, etc.
However, we checked your site and it's not true that you did imported Be|Blogger because you imported different demos in the past. Currently, you got Be|Agency. Like we previously wrote, you supposed to clear whole WP with https://wordpress.org/plugins/wordpress-reset/ because at this moment you got different demos than you are saying.