Foodmania theme has the option to change your cover photo through rtMedia plugin which will reflect on your profile of Buddypress.
Follow the simple steps to setup cover photo to your profile,
rtMedia Settings > Image Sizes (/wp-admin/admin.php?page=rtmedia-settings#rtmedia-sizes) option tab, here you will see the Media Size Settings.
Add width and height as 1600 and 600 to set the exact dimensions in Featured row, also user can check the crop checkbox to crop the image in provided width and height.
After doing the backend settings, click on Save Settings button. Also, you can use Regenerate Thumbnails plugin to regenerate images if you want to set existing (already uploaded in media library) image as your cover photo.
Click on Options link and select
Set as Featured option. Now visit your profile, it has would have replaced the default image with the same image that you selected.
You can also change the cover photo with the help
Change Cover menu option. You can see this option once you hover on current cover photo. You can remove cover photo, upload cover photo and choose cover photo from existing photos.
See the following image for more details.