Reply to Anne:
Access your hosting via FTP client, go to the theme folder, CSS folder and open nivo-slider.css (I suggest to make a back-up of the original nivo-slider.css file first). Go to line 65 “top: 57%”. This is my file but the higher the padding percentage, the lower the caption box will be in relation to the logo and navigation. Once you change the percentage, reload the nivo-slider.css and replace the original. You may have to try a few times and test in multiple browsers.
.nivo-caption {
position:absolute;
left:8%;
top:57%;
-webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
-moz-box-sizing: border-box; /* Firefox, other Gecko */
box-sizing: border-box; /* Opera/IE 8+ */
color:#000000;
z-index:8;
padding:10px;
overflow: hidden;
display: none;
min-height:165px;
background-color:rgba(255,255,255,0.7);
}