eggdesign Hi
You can kindly refer to this documentation for creating new module position named masthead-top for assigning specific module as envisaged to be positioned. Also, You may require to add some CSS rule-sets in order to position the module properly
Tips provided here also could be of help:
https://member.joomlart.com/forums/d/1136-can-i-add-extra-search-fields-in-ja-teline-v/35
The code snippet for adding new position can be added in /templates/ja_mono/tpls/blocks/block-left.php file above the below mentioned code around line 21:
<div class="t3-masthead col-sm-12<?php $this->_c('masthead') ?>">
Hope this helps 🙂