www.wysiwygwebbuilder.com

I need to insert html lines directly into a page created with the programme, but I can't do this as the programme, as stated, is not an html editor. So how can I do it? Thank you

You can add custom code via Page HTML or an HTML object.
https://www.wysiwygwebbuilder.com/add_html.html

I need to insert html lines directly into a page created with the programme

What do you mean by that? Do you mean you wish to add a script?
If it is a script then you can use the following:
http://www.wysiwygwebbuilder.com/add_html.html

Many thanks, I have solved the problem. I did not know the use of "Object html".