TL;DR: check out the video at the bottom

Icons are a great way to showcase your social, contacts, music and profiles on external websites.
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Lnk.Bio has one of the largest collections of icons and services that you can add to your profile.

To add more Icons head over to the Style section and scroll down until you see the Icons section and tap on the Add Icon button as shown below:

Once the new window pops up, use the search field to type the name of the service you're looking for. After you type 2 characters or more, you'll see the matching services as shown below:

Tap on the service you want to add and then add your Lnk as shown below: