add edit a link on Joomla mac

Hi
I just switch to Mac few days ago, I have mac 10.5.4
I work on Joomla for my job, on Firefox I can add an item and apply it but no link,I try to add a link or edit on joomla, a new pop up open but remain blank, nothing to fill to add the web site when I try to work on safari, it let me add the link but it does not let me apply the new item neither save it
what shall I do
pleaaaaase help

thank you