guys, kinda noob with this hosting thingy but i do know about internet apps and other computer sw. and have some experience in HTML.

so i got my website built by a company sometime back, and now i want to kinda do it myself, you know, just some minor changes on company product.
so i ask him about admin login credential.

he reply in the mail with below info, so how do i grab those files and edit them and also replace the photo?

FTP Host: companywebsite.com
User id: abcde
Password: 123456

please advice. thanks.