How to include an embed script on my blog page

What kind of script?

I would not be able to explain exact technical terms.

But, providing the sample, for your kind reference and due advising:
<script language=”javascript” src=”https://www.go-green.ae/widget/widget1.php”></script&gt;

How, where, step-by-step explanation would be of immense help and great learning for me.

Thanks for your support.

You should be able to use text widget to add it sidebar.