@kota,

③ Css problem, 

use the following CSS code: 

@media screen and (max-width: 620px){
   #wpforo #wpforo-wrap .wpfl-2 .wpforo-post .wpf-left .author-title {
      display: inline-block;
    }
}

The CSS codes should be added in the "Custom CSS code" textarea, located in the Dashboard > Forums > Settings > Style Tab.  Please don't forget to delete all caches and press Ctrl+F5 (twice) on the frontend before checking to reload the updated CSS file.    

④ Home icon

How about this issue?

This is designed to work in this way. 

I unchecked the "Front - Can view member subscriptions" CAN. But the subscriptions icon still appear. How can I remove it?

Please provide a screenshot

⑥ Remove URL icon

Ho can I remove?

Use the following CSS codes: 

i.fas.fa-link.wpfsx {
   display: none;
}
#wpforo #wpforo-wrap .wpf-sb.wpf-sb-top .wpf-sb-buttons {
   border: none !important;
}

⑦ Remove only “dislike” icon

The "dislike" button is visible only for the users who have already liked the post. It allows members to cancel the "like"  they've clicked.

⑧ Remove Quote box

Use this code:

span.wpf-action.wpforo-quote {
    display: none !important;
}