Yes, I have to add this to the Shopify version. Currently, it just shows the Facebook icon for "recommended".

Sorry, so if you are not using the section the actual CSS code would be this for the margins...

.wprs_unslider{
margin-left: 30px;
margin-right: 30px;
}

For the cursor make sure you have the !important tag on it like so...

.wprs_unslider-arrow {
cursor: pointer !important;
}

There are two ways to change the margin. 

1) If you use the Social Testimonial Slider section in your theme then use this setting...

2) You can add this CSS code to the review template custom CSS field.

div.srs_slider {
margin-left: 30px;
margin-right: 30px;
}

The "do not enter" symbol is coming from some of your theme CSS overriding the plugin. Add this CSS to the review template custom CSS section to fix.

.wprs_unslider-arrow {
cursor: pointer !important;
}

Can you post a link to the reviews? The number of reviews that show are controlled by the number of slides or the number you show per a row and number of columns.

There currently isn't an easy way to do that. There is a workaround here...

https://testimonialhubshopify.userecho.com/en/knowledge-bases/2/articles/80-one-review-on-mobile-view

Are the most recent reviews showing in the App on the Review List? If not, then download them. If so, then make sure the review template is displaying newest and not random.

Go to the App and re-save the review template. Then follow the instructions by clicking the instructions button to make sure the code is still on your theme. Also, make sure you still have reviews on the Review List.

Can you share the Facebook page or a link to the reviews on your site?

After you have some reviews downloaded onto the Review List go to the Template tab and create a review template. After you save it there will be an instructions button on the right.