Yes, you can change your username up to three times. If you have any technical problems please Contact us from this (Page).
To change your Username:
1. Click on avatar, on the top right corner, and choose Settings from the drop-down menu.
OR Go to your Profile page and click on Edit Profile on the bottom right corner of your cover image.
3. Edit your Username. You will see if your username is available and a new link to your profile below.
4. Click Save. If your Username was changed successful you will receive a notification on the top of your screen.