You, it requires a bit of basic knowledge of HTML and CSS; you can use any font available in Google Fonts, follow these steps:

1. Go to Google Fonts and select all the fonts that you want to use

2. Copy the <link href ... code

3. In Zumpul, edit the signature, change to HTML source and paste the <link href... code above everything

4. Go to Google Fonts and copy the 'font-family: ... ' CSS property

5. Get back to Zumpul and go to the HTML source, search the <div> or <p> where the text is located and add "style=font-family:....", the result should look something like this:

<link href="https://fonts.googleapis.com/css?family=Gaegu" rel="stylesheet" /><br />

&nbsp;

<div style="font-family: 'Gaegu', cursive;">${firstName} ${lastName} | Email: ${primaryEmail}<br />

${company}</div>

6. Save the changes