You can use your own custom fonts in ExploreMyPC by uploading it in the builder. This functionality is available only in the PRO paid plans.
Uploading a Custom Font
Step 1. From any text element in the page, click on Add New Font in the options toolbar
Keep in mind that you don't have to upload all the files for the font, Usually and most common is .ttf and will do the job.
If your file has another extension like .otf, you can easily convert it to a .ttf online for free: https://convertio.co/otf-ttf/
Keep in mind that for each variation (Light, Normal, Bold, etc) you'll need to repeat Step 4 and upload each font.
Keep in mind that you can delete any font from the Fonts Tab after you press the Add New Font button.