Some sites have website building tools but I tried Freeservers and they are very limited.

I just signed up for a free account with Freeservers so I could have a look. I agree, unless the paid accounts have access to different editing tools, there is not much there. You'd have to save the page to which you want to make changes on your computer, edit the text in Notepad or a similar text editor, then FTP it back to the site.