Header and footer errors

Hi,
I’ve just installed your free version to test drive before buying your premium (I need two icons in the paid one, plus the option to select the text). However, I’m immediately getting the error messages below.

When I’ve gone to my theme’s support forum, I found other requests for help after installing your plugin. Support said, “It looks like it’s generated by a plugin that is poorly coded.” (Those are their words, not mine!)

I use a child theme, so don’t have easy access to the files you say are faulty. Apart from that, I cannot be expected to edit files every time an update is released.

I really wanted to use your plugin because it’s got features none of the other social media ones have, but this makes it impossible.

Is there any easy way I can get your plugin to work, or do I have to abandon it, please?

Thanks,
Steve
Errors
Error : Please fix your theme to make plugins work correctly: Go to the Theme Editor and insert <?php wp_head(); ?> just before the line of your theme’s header.php file.

Error : Please fix your theme to make plugins work correctly: Go to the Theme Editor and insert <?php wp_footer(); ?> as the first line of your theme’s footer.php file.