Below is a FAQ microdata schema code template you can copy and paste and add to your page HTML. You would repeat the .faq-question div block for each QA answer set. Once you are done adding your markup you can test it in the Google schema tester.
If you are using WordPress, I noticed the rich text editor strips out the important microdata code. I found this plugin that prevents this and makes it work as it should.
<div class="schema-faq-code" itemscope="" itemtype="https://schema.org/FAQPage">
<h4>Frequently asked questions</h4>
<hr />
<!-- repeat question blocks as needed -->
<div itemscope="" itemprop="mainEntity" itemtype="https://schema.org/Question" class="faq-question">
<h3 itemprop="name" itemprop="name" class="faq-q">Question text</h3>
<div itemscope="" itemprop="acceptedAnswer" itemtype="https://schema.org/Answer">
<p itemprop="text" itemprop="text" class="faq-a">Answer text</p>
</div>
</div>
<!-- /.faq-question -->
</div>