By going to the "Edit my profile" section under your profile picture.
Then, just go to the "My Links" part and start editing your links.
Here's the different formats for each media:
- For Facebook : add the name of your page/profile the same way it appears on the URL.
For example : if your page looks this way: http://www.facebook.com/abcdefghij, you'll just have to put: /abcdefhij
- For Twitter : just add your @
- For Instagram :just add your @
- For Snapchat : just add your snap (without the @)
- Pour Youtube : the link to your channel