You can finish your Musixmatch profile through either the desktop site or the app. In a smartphone, your Contribute tab will show you a message stating how much of your profile is complete. Tap on the message and proceed to complete it. Apart from this in the contribute tab you can:
1) Touch the profile picture on the top right of the screen, directing you to your profile page.
2) In your profile page, tap on the touch the 3 dots icon and touch "Edit Profile"
3) Your profile can be finished by adding "Native Languages", "Other Languages", "Favorite Genres", "Favorite Artists"
On desktop site:
1) Log into your page.
2) Open the profile page.
3) Click the “Edit Profile” option.
4) Finish your profile by typing out "Native Languages", "Other Languages", "Favorite Genres", and "Favorite Artists"