Coloring/painting page to match a copied header color

Hi everyone.

I am new to Corel (well, I haven't used it since the 90s)

What I am trying to do is paint a page to match a copied header color (Elks Club).

I have tried to use the eye dropper and bucket, but I get the slash-thru bucket which is telling me no.

Please advise!
Thanks, Jeanne