Be sure to set your username and custom profile URL link so you can use a nice and short URL for your profile.
Example: https://librti.com/username
Click on your profile image in the top right hand corner to open the dropdown menu and select Settings.
Select Account from the top navigation, and simply enter the username you would like to use. Of course it must be unique, so if another member has already used it, you will need to create a unique username.