Hi
1. For add image button to the menu bar, I’m not familar with any related plugins, but as my understand, you need to add custom button HTML into header.php, I suggest you create a child theme if you will change the header.php file.
For example, add the following HTML above
<nav id="primary-menu">...</div>
<div style="float:right;"><a href=""><img src="" /></a></div>
Adjust the code above to what you want, it’s only a general idea, because the customization issue is not included in the support 🙂
2. For remove the search icon, go to “Samsara Options > Custom styles > Hide Search Button From Menu” , select Yes.
3. For remove the bottom widget area, , go to “Samsara Options > Custom styles > Remove Bottom Widget Area“ , select Yes.
Thanks