Hi.,
1) Please refer the screenshot : https://snag.gy/Vpy4nd.jpg
Please navigate to Admin Panel > Header > Customize Your Header > Edit Colour
2) Please refer the screenshot : http://prntscr.com/ll3y06
Get into Admin Panel > Appearance > Customize > Additional CSS > Paste the below css code inside the text area > Save All.
.wpb_column.dtlms-slider-overlay.dtlms-search-slider p { color: #ffd800 !important; }