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Solution:

By editing the ps_socialfollow.tpl file starting from line 93, paste the following code: 

{if !empty(Configuration::get('BLOCKSOCIAL_TIKTOK', $language.id))}
            <li class="tiktok">
                <a href="https://www.tiktok.com/yourlinkprofile" rel="noreferrer" title="TikTok">
                    <span class="tiktok-icon">                    <span class="tiktok-icon">
                        <svg width="20" height="20" viewBox="0 0 48 48" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
                            <path d="M30 8.1c1.9 1.7 4.3 2.8 7 2.9v6.2c-2.6-.1-5-1-7-2.4v12.6c0 6.2-5 11.3-11.3 11.3S8.4 33.6 8.4 27.4c0-6.3 5.1-11.3 11.3-11.3 1.1 0 2.1.2 3.1.5v6.5a5 5 0 1 0 0 8.6V8h7.2v.1z"/>
                        </svg>
                    </span>
                </a>
            </li>
            {/if}