Text box edition = complete nightmare!

Simply trying to update colour and size of fonts and about 20 text boxes.
Complete nightmare, anytime I paste text in a box, the box turn into HTML code and I am unable to change anything. The solution so far is to paste the text in another Hype file, strip off the code and paste the text box again into the original page. But again the text will show again with the code and again it is impossible to edit.
Any better way will be naturally welcome. thanks.

This might help: