Under the video on home page.  as your scroll down you see recent log in's.

Click where it says view more.

 You then see the pictures of recent members who signed in , Above the pictures of members to the right you see,

Keyword search for:

with the word in box  "username"

Place the user name your looking for there then click search , it will take you to that member.

 Than You than click on that profile picture it takes you to their page.