Doubt on First Steps

Hi,

I just bought the Pro version but I’m not sure how to replace long texts on my website posts. They are not codes or URLs are simple texts 200-300 characters. Changes such content would be permanent.
Please can you guide me how I can do this?

Thank you,
Guilherme

https://ww.wp.xz.cn/plugins/real-time-find-and-replace/