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Use this instead for administrators only
{{if \IPS\Member::loggedIn()->isAdmin()}} Posts:= {number="$member->member_posts"} {{endif}}  

You can do that like this 
Add this line to custom.css
.ipsComment_highlighted:not(.ipsBox_transparent):not(.ipsModerated):not(.ipsComment_selected):not(.ipsComment_popular )[data-membergroup="x"] { background: black; border: 1px solid #fff; }  The 'x' from data-membergroup="x" stands for the group id,  you can copy and modify it for each group.

Delete in forums/front/index/index the following 
{{if \IPS\Member::loggedIn()->member_id}} <ul class='ipsToolList ipsToolList_horizontal ipsClearfix ipsPos_right'> <li class='ipsToolList_primaryAction ipsResponsive_hidePhone'> <a class="ipsButton ipsButton_medium ipsButton_important" href="{url="app=forums&module=forums&controller=forums&do=add" seoTemplate="topic_non_forum_add_button"}" data-ipsDialog data-ipsDialog-size='narrow' data-ipsDialog-title='{lang="select_forum"}'>{lang="start_new_topic"}</a> </li> {template="viewChange" group="global" app="forums" params=""} </ul> {{endif}}  

.ipsItemStatus.ipsItemStatus_large .ipsItemStatus.ipsItemStatus_read Edit text-shadow / ta_base.css 

Edit the ta.library.js and search for 
ta_c.setAttribute("style","display:inline !important") replace it with 
ta_c.setAttribute("style","display:none !important")  

It's because you have 2 header blocks.
You have an existing <header> block, add the menu to it.
Change this
<div id='ipsLayout_header'> <header id='header'> <div class='ipsLayout_container flex flex-jB'> <div class='flex01 flex11-t'>{template="logo" app="core" group="global" params=""}</div> {{if !in_array('ipsLayout_minimal', \IPS\Output::i()->bodyClasses )}}<div class='user-links user-links-sep'>{template="userBar" app="core" group="global" params=""}</div>{{endif}} </div> </header> <div class='nav-bar'> <div class='ipsLayout_container flex flex-jB flex-aS'> <div class='flex11'>{template="navBar" app="core" group="global" params=""}</div> <div class='ipsfocus-search'></div> </div> </div> </div> with this
<div id='ipsLayout_header'> <header id='header'> <div class='ipsLayout_container flex flex-jB'> <div class='flex01 flex11-t'>{template="logo" app="core" group="global" params=""}</div> {{if !in_array('ipsLayout_minimal', \IPS\Output::i()->bodyClasses )}}<div class='user-links user-links-sep'>{template="userBar" app="core" group="global" params=""}</div>{{endif}} </div> <div class='nav-bar'> <div class='ipsLayout_container flex flex-jB flex-aS'> <div class='flex11'>{template="navBar" app="core" group="global" params=""}</div> <div class='ipsfocus-search'></div> </div> </div> </header> </div>  

Make sure you didn't reach your server/hosting upload limits. 
If you have acces to php.ini tweak the following to your needs.
file_uploads upload_max_filesize max_input_time max_execution_time post_max_size  

Search for 
.cPost .cPost_contentWrap Usually found in forums.css and replace everything with this
position: relative; border-left: 2px solid #424448; /* change the color and size */ padding: 7px 15px 15px 10px;