For question nunber (1), this is what I mean...

Hi @zazzy,

1) How do I set pictures on the entire forum to display as a normal picture instead of displaying as a file format.

wpForo supports image URL auto-embed:

I'd suggest you read Robert's answer in this support topic:

https://wpforo.com/community/how-to-and-troubleshooting-2/how-can-i-actually-make-my-forum-truly-private/#post-21748

This support topic also should be helpful, please check it out: 

https://wpforo.com/community/how-to-and-troubleshooting-2/how-can-i-swtich-off-the-xml-sitemap/paged/2/

Also please read this support topic it also should be helpful:

https://wpforo.com/community/how-to-and-troubleshooting-2/how-to-add-the-image-button-to-mce-toolbar-editor/#post-2401

 2) Is there a way I can display total views of all topics on the forum's statistics panel?

Please read this support topic:

https://wpforo.com/community/how-to-and-troubleshooting-2/remove-post-view-count/#post-20398

3)How do I make font post font to be set at 12pt by default?

The option is located in Dashboard > Forums > Settings > Styles admin page. 

More info here: 

https://wpforo.com/docs/root/wpforo-settings/style-settings/

4) How do I remove the panel attached below.

I don't follow you. Do you mean disabling the whole buttons? 

For one (1), there is a solution provided here if you did a little search.

But anyways, here it comes ready for you. Add this to your THEME functions.

add_filter('wpforo_content_after', 'wpforo_default_attachment_image_embed', 11);

function wpforo_default_attachment_image_embed($content)
{
    if (preg_match_all('|<a class=\"wpforo\-default\-attachment\" href\=\"([^\"\']+)\"[^><]*>.+?<\/a>|is', $content, $data, PREG_SET_ORDER)) {
        foreach ($data as $array) {
            if (isset($array[1])) {
                $file = $array[1];
                $e    = strtolower(substr(strrchr($file, '.'), 1));
                if ($e == 'jpg' || $e == 'jpeg' || $e == 'png' || $e == 'gif') {
                    $filename = explode('/', $file);
                    $filename = end($filename);
                    $html     = '<a href="' . esc_url($file) . '" target="_blank"><img class="wpforo-default-image-attachment" src="' . esc_url($file) . '" alt="' . esc_attr($filename) . '" title="' . esc_attr($filename) . '" /></a>';
                    $content  = str_replace($array[0], $html, $content);
                }
            }
        }
    }
    return $content;
}

Also if you want to have Youtube auto-embed, also add this to your THEME's functions file:

add_filter('wpforo_content_after', 'wpforo_custom_video_embed', 10);

function wpforo_custom_video_embed($content)
{

$paterns = array();

$paterns[] = "/<a[^><]+>\s*[a-zA-Z\/\/:\.]*youtube.com\/watch\?v=([a-zA-Z0-9\-_]+)([a-zA-Z0-9\/\*\-\_\?\&\;\%\=\.]*)/i";

$paterns[] = "/<a[^><]+>\s*[a-zA-Z\/\/:\.]*youtu.be\/([a-zA-Z0-9\-_]+)([a-zA-Z0-9\/\*\-\_\?\&\;\%\=\.]*)/i";

$content = preg_replace($paterns, "<iframe width=\"420\" height=\"280\" src=\"//www.youtube.com/embed/$1\" frameborder=\"0\" allowfullscreen></iframe>", $content);

return $content;

}