No standard HTML in widget

I have simple HTML in a footer widget to direct traffic on my site. I just need to be able to add a line to it, but it keeps indicating errors where there are none! Searching turned up a discussion but it does not tell me how to get my HTML to work, which is all I want. I can’t understand what this is saying to do and I don’t have hours to spend on some unknown thing to replace ordinary simple and previously working HTML. HELP

(this doesn’t help—->https://make.ww.wp.xz.cn/core/2017/08/01/fixes-to-text-widget-and-introduction-of-custom-html-widget-in-4-8-1/)

(It is a widget not a page)

• This topic was modified 8 years, 6 months ago by mendopower.
• This topic was modified 8 years, 6 months ago by mendopower.