Simply put and customize the widget wherever you want:
<div id="stlfinder-widget" class="stlfinder-widget"
data-init-search=""
data-header-bg=""
data-input-bg=""
data-button-bg=""
data-button-color=""
data-search-results-bg=""
data-title-color=""
data-footer-bg=""
data-footer-color=""
></div>
and place the following script to your website:
<script id="stlfinder_script" src="https://ilkin.eu/projects/js_widget/js/widget.js"></script>
Note: You may have multiple widgets in one page, just use unique ID for each widget!