Hi Edith,
could you give us some more details, like exactly what you are doing and what happens when you do that?

Also, could you give us some details about your computer setup? You can look at some of the other message on this forum about chat problems and see the kinds of information other people gave. (You might also find the answer to your problem by reading some of the other posts.)

But mainly, to be able to have any idea what the problem might be, we need some details.

Kitty