If you’re already signed in, you can skip to the next step. Otherwise, enter your email address (or phone number) and Facebook password into the fields, then tap Log In. There are a few different ways you can find someone's profile page:  Tap the search box (or magnifying glass) at the top of the screen, then type someone’s name, email address, or phone number. Tap a person's name in a comment or post to open their profile page. Tap the ☰ icon at the bottom right of the screen, and then tap "Friends." From there, you can see your list of current Friends or click "Suggestions," "Contacts" or "Search" to find other people you may know. Open your friends' friend lists and tap someone's name to see their profile. It’s below the person's profile photo and name, or next to their name in Find Friends. A friend request will be sent immediately, and you will receive a notification once it is accepted.  If you don’t see Add Friend, the person you are trying to add does not accept friend requests from people with whom they have no mutual friends. If you change your mind about a friend request you’ve already sent, you can cancel it by opening that person’s Facebook profile and tapping Cancel Request.

How would you rephrase that briefly using Vietnamese?
Mở ứng dụng Facebook. Đăng nhập vào tài khoản Facebook. Mở trang cá nhân của người mà bạn muốn thêm bạn. Trên trang cá nhân, nhấn nút Add Friend nằm bên dưới ảnh đại diện và tên người đó, còn trong mục Find Friends (Tìm bạn bè), nút này nằm cạnh tên  của họ.