For send your data to Facebook Business you must have the Facebook pixel implemented in your site. Also, you need the Facebook Audience Matching activated in EPICA platform. For this requirement you must request it from your client partner.
To check if the audience matching is enabled, you can use the Facebook Pixel Helper extension in your Chrome's browser. Check here Facebook Pixel Server Helper Extension
If the condition above have been completed, EPICA will start to fill the audience in facebook.
Create custom audience in FACEBOOK BUSINESS
In your Facebook Business account. Select Audiences
Create new audiences -> Custom Audiences:
Select Website Traffic:
Select property AudienceMatching:
Select the dimension Cluster:
Fill the gap with the Cluster's id (you must include the cluster's id between comas). You can find the cluster's id in EPICA platform , Cluster section.
Epica -> Cluster section