How to remove Post date, Post author and Post comments

Hello,
In the link you have provided I don’t seem to see what you are asking for.
Please can you ask a specific question ?
Now if you want to remove the author,date etc from your widgets
go to Dashboard=>Appearance=>Customize=>Design Options => Custom Css and add the following code

span.cat-links {
    display: none;
}
.below-entry-meta {
    display: none;
}

Hope this helps.
regards.