Hello Torstein

Thank you for your purchase.

Checkboxes are available only as Filtering options in wpDataTables. If that's what you want to change, it would have to be done with some customization of the plugin. Unfortunately, custom work is not included in the provided support for the plugin.

If you want to have an image, and have that image be a hyperlink, you can add it in a string-type column, like this:

<a href="link-to-the-page"><img src="url-to-the-image"></a>

To center the cells, you would need to add a custom CSS class, for example "center", then define it in Custom CSS field, in main settings of wpDataTables/Custom JS and CSS.

table.wpDataTable .center {
text-align: center !important;
}

To center the table's Search field, you could add this CSS:

.wpDataTablesWrapper .dataTables_filter {
float: left !important;
width: 50% !important;
}

But there's no way of adding it in the table, if that's what you asked.