In Settings you insert your account, it should be green and active. Then you add your file. It is the same like from browser. You can insert a description but you can also leave it empty. Password is for that file, not for account. Their site does not support that so leave it empty (you can change it from browser on their site).
Use File & Image Uploader 7.3.9 In Setting/File hoster Host loadus.net / Username : my user Check account ==> active : yes Description <== what must I type ? Password : my pass Click upload ,having file in loadus But can not download becase loaddus say that Wrong password