Step 1: please go to https://fontawesome.com/v4.7.0/get-started/ and enter your email

Step 2: You will get an email with the embed code like shown in the screenshot below, please copy it:

Step 3: Go to your shopify dashboard -> online store -> themes -> Debutify theme-> actions -> edit code -> theme.liquid file. Find the below code:

Step 4: Replace the step 3 code with the font awesome embed code and save:

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